Answer:
The molar mass of Mg2SiO4 can be calculated by adding the atomic masses of each element:
Mg: 2 x 24.31 g/mol = 48.62 g/mol
Si: 1 x 28.09 g/mol = 28.09 g/mol
O: 4 x 16.00 g/mol = 64.00 g/mol
Molar mass of Mg2SiO4 = 48.62 + 28.09 + 64.00 = 140.71 g/mol
To calculate the number of oxygen atoms in a 120.0 g sample of forsterite, we first need to calculate the number of moles of Mg2SiO4 in the sample:
n = mass / molar mass = 120.0 g / 140.71 g/mol = 0.853 mol
Next, we can use the molecular formula to determine the number of oxygen atoms in one mole of Mg2SiO4:
Mg2SiO4 has 4 oxygen atoms per molecule, so one mole of Mg2SiO4 has 4 moles of oxygen atoms.
Therefore, the number of oxygen atoms in 0.853 mol of Mg2SiO4 is:
0.853 mol Mg2SiO4 x 4 mol O / 1 mol Mg2SiO4 = 3.412 mol O
Finally, we can convert the number of oxygen atoms to a more convenient unit, such as atoms. One mole of oxygen atoms contains 6.022 x 10^23 atoms, so the total number of oxygen atoms in 0.853 mol of Mg2SiO4 is:
3.412 mol O x 6.022 x 10^23 atoms/mol = 2.055 x 10^24 atoms of oxygen
Rounding this result to 4 significant digits, we get:
2.055 x 10^24 atoms of oxygen (to 4 significant digits)
Explanation:
8. Making soap is what type of reaction is it
Chemical
Physical
Phase change
all of the above
Answer:
chemical reaction
Explanation:
Answer:
Making soap can be considered a chemical reaction.
Explanation:
In the process of making soap, a reaction takes place between a fat or oil and an alkali, such as lye (sodium hydroxide), which results in the formation of soap molecules and glycerol. This reaction is known as saponification. The change in the composition of the reactants to form a new substance is a chemical change, not a physical change or a phase change.
In the wave models, you imagined adding energy into the wave by moving your arm up and down or back and forth. These are called mechanical waves. Explain how you know that energy traveled from you to your friend. In your answer, identify the medium that the energy traveled through.
The energy traveled from you to your friend through the medium of the air. When you moved your arm, the energy created a vibration in the air which then propagated in all directions. As the wave traveled, it passed through the air and eventually reached your friend, carrying energy with it.
What is energy?Energy is the ability to do work or cause change. It is the capacity to cause motion, to create heat, to transform matter, or to generate electricity. It can come from a variety of sources, such as the sun, wind, water, fossil fuels, nuclear energy, and other renewable sources. Energy can also be stored in batteries or fuel cells. It is a fundamental component of the universe and is essential for life. All life forms require energy to survive and grow, and energy is also necessary for the development of technology. Without energy, the world would not function as it does today.
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what is the main function of the chloroplasts in a plant cell
Answer:
The main function of chloroplast in a plant is to prepare food for the plant, by the process of photosynthetic in the plant cell
Chloroplast contains a green pigment
Explanation:
Answer:
The main function of chloroplasts in a plant cell is to perform photosynthesis. Chloroplasts contain chlorophyll, which absorbs light energy and converts it into chemical energy through a process called the light-dependent reactions. The chemical energy is then used to produce glucose and other sugars from carbon dioxide and water in a process called the light-independent reactions or the Calvin cycle. This process provides the plant with its energy source, as well as produces oxygen as a by-product.
Explanation:
Santiago works in tech support, and a customer has called him to get some help with a file that they are having trouble opening. Santiago asks them, “What is the file extension?” They reply, “How do I figure that out?” Which of these statements is the best response?
Group of answer choices
“Look at the size of the file.”
“Look at the first word of the file name.”
“Look at the letters that follow the dot after the file name.”
“Look at the letters before the dot before the file name.”
The best response to the customer's question, "How do I figure out the file extension?" is:
"Look at the letters that follow the dot after the file name."
What is Customer?
A customer is a person or organization that buys or uses goods or services produced by another person or organization. Customers are an essential part of any business or economy, as they create demand for products and services, which in turn drives economic activity.
Customers may be individuals, such as consumers who buy products for personal use, or businesses, which buy products for use in their operations or to sell to their own customers. Customers may also be government agencies, non-profit organizations, or other institutions.
The file extension is typically the letters that follow the last dot in the file name. For example, if the file name is "document.pdf", the file extension is ".pdf". The file extension is used to indicate the type of file and the software that should be used to open it. Knowing the file extension is important because it helps in troubleshooting issues with opening files, as different file types may require different software to open them.
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How many moles of lithium fluoride (LiF) are present in a 39 gram sample?
Answer:
[tex]\huge\boxed{\sf n = 1.5\ mol}[/tex]
Explanation:
Given data:Mass = m = 39 g
Molar mass = M = 7 + 19 = 26 g/mol
Required:No. of moles = n = ?
Formula:[tex]\displaystyle n = \frac{m}{M}[/tex]
Solution:Put the given data in the above formula.
n = 39/26
n = 1.5 mol[tex]\rule[225]{225}{2}[/tex]
Calculate the quantity of O₂ would be required to generate 13.0 mol of NO₂ in the reaction below assuming the reaction has only 67.1% yield.
2 NO (g) + O₂ (g) → 2 NO₂ (g)
Solving the Question
We're given:
[tex]2 NO_{(g)} + O_{2(g)}\rightarrow 2 NO_{2 (g)}[/tex][tex]n_{NO_2}=13.0\hspace{4}mol[/tex][tex]\%\hspace{4}yield=67.1\%[/tex]First, let's calculate the theoretical yield of NO2.
⇒ [tex]\%\hspace{4}yield=\dfrac{actual\hspace{4}yield}{theoretical\hspace{4}yield}[/tex]
The yield of NO2 we must produce is 13.0 mol.
⇒ [tex]\%\hspace{4}yield=\dfrac{13.0}{theoretical\hspace{4}yield}[/tex]
We're also given that the percentage yield of this reaction is 67.1%.
⇒ [tex]0.671=\dfrac{13.0}{theoretical\hspace{4}yield}[/tex]
⇒ [tex]theoretical\hspace{4}yield=\dfrac{13.0}{0.671}\\\\theoretical\hspace{4}yield=19.3740685544\hspace{4}mol[/tex]
First, construct a mole ratio between O2 and NO2.
From the balanced chemical equation, we know that 1 mol of O2 can produce 2 mol of NO2:
⇒ [tex]\dfrac{n_{O_2}}{1}=\dfrac{n_{NO_2}}{2}[/tex]
We're given that we must theoretically produce 19.3740685544 mol of NO2:
⇒ [tex]\dfrac{n_{O_2}}{1}=\dfrac{19.3740685544}{2}[/tex]
⇒ [tex]n_{O_2}=9.6870342772\hspace{4}mol[/tex]
Round to significant figures (3):
⇒ [tex]n_{O_2}=9.69\hspace{4}mol[/tex]
Answer[tex]n_{O_2}=9.69\hspace{4}mol[/tex]
A phosphate-ion (PO43-) level in a water sample is 93.1 ppm (or mg/L). What is the concentration of this phosphate sample in molarity? Density of water is 1 g/mL Note: In the field of water quality, ppm and mg/L are the same unit.
Answer:
The molarity of a solution can be calculated by dividing the number of moles of solute by the volume of the solution in liters. To calculate the number of moles of solute in a solution, we first need to find the mass of the solute.
Since the concentration of the phosphate sample is given in mg/L (ppm), we can convert this to grams by multiplying by 0.001:
93.1 mg/L x 0.001 g/mg = 0.0931 g/L
Next, we can find the number of moles of solute by dividing the mass of solute by its molar mass:
0.0931 g ÷ (1 mol/94 g) = 0.000989 mol/L
Finally, we can find the molarity of the solution by dividing the number of moles of solute by the volume of the solution:
0.000989 mol ÷ (1 L) = 0.000989 M
While calculating the ending amounts of product after an
experiment, Jose found that he had made 0.35 moles of
iron. His goal was to make 40 grams of iron, did he reach
his goal?
Yes, Jose reached his goal.
What is the mole?In chemistry, the mole is a unit used to measure the amount of a substance. It is defined as the amount of a substance that contains the same number of entities (such as atoms, molecules, or ions) as there are atoms in 12 grams of pure carbon-12. This number is known as Avogadro's number and is approximately equal to 6.022 × 10^23.
The concept of the mole is fundamental to many areas of chemistry, including stoichiometry, the study of chemical reactions and their quantitative relationships. It allows chemists to make precise measurements and calculations, and to compare and relate the properties of different substances.
Number of moles in 40 g of iron = 40g/56 g/mol
= 0.7 moles
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A compound is found to have a molar mass of 598 g mol-1. If 39 mg of the compound is dissolved in enough water to make 162 mL of solution at 25 oC, what is the osmotic pressure of the resulting solution (in units of mbar). Report your answer to 1 decimal place. (R = 0.08314 bar L mol-1 K-1)
The osmotic pressure of a solution made by absorbing 0.822 g of it within 300 cm 3 of water is 149 mm Hg at 298 K. The solute has a molar mass of 342 g mol 1.
How can you determine a solute's molar mass?Calculate the molar mass of the solution using the depression at the freeing point (T f). Next, determine the moles of solute using the molality equation. To get the molar mass, divide the solute's mass in grams by the number of moles.
How do you determine the mass percent concentration of a solute and a solvent?The percentage of a solute in the solvent is one way to express a concentration of a solution. The percentage can be determined further in one of two ways the quantity determined by dividing the amount of the solute by the concentration of the sample.
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How many grams of copper (i) nitrate (cuno 3 ) are required to produce 44. 00 grams of aluminum nitrate (al (no 3 )3 )?.
To determine how many grams of copper (I) nitrate (CuNO3) are required to produce 44.00 grams of aluminum nitrate (Al(NO3)3), we need to use stoichiometry and the balanced chemical equation that relates the two compounds.
The balanced chemical equation for the reaction is: 3CuNO3 + 2Al -> 3Cu + 2Al(NO3)3 This equation tells us that 3 moles of CuNO3 react with 2 moles of Al to produce 2 moles of Al(NO3)3 and 3 moles of Cu.
We can use this information to calculate the amount of CuNO3 required to produce 44.00 grams of Al(NO3)3 as follows: Calculate the molar mass of Al(NO3)3: Al(NO3)3 = 1(26.98) + 3(14.01 + 3(16.00)) = 213.00 g/mol
Convert the given mass of Al(NO3)3 to moles: moles Al(NO3)3 = 44.00 g / 213.00 g/mol = 0.2065 mol Use the stoichiometric ratio from the balanced chemical equation to determine the moles of CuNO3 required: 3 moles CuNO3 / 2 moles Al(NO3)3 = x moles CuNO3 / 0.2065 moles Al(NO3)3 x moles CuNO3 = 3/2 x 0.2065 mol = 0.3097 mol
By using the balanced chemical equation, we can relate the amount of one compound to the amount of another compound in the reaction. This allows us to use stoichiometry to calculate the amount of one compound required to produce a given amount of another compound.
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Arrange the following solutions in order by their decreasing freezing points: 0. 1 m na3po4, 0. 1 m c2h5oh, 0. 01 m co2, 0. 15 m nacl, and 0. 2 m cacl2.
The solutions can be arranged in order of decreasing freezing points as follows: 0.2 M CaCl2 > 0.15 M NaCl > 0.1 M Na3PO4 > 0.1 M C2H5OH > 0.01 M CO2
The freezing point of a solution is lowered by the presence of solute particles, and the degree of lowering is proportional to the concentration of the solute.
Based on the given concentrations, we can arrange the solutions in order of decreasing freezing points as follows:
0.2 M CaCl2: This solution has the highest concentration of solute particles, and therefore the lowest freezing point. Calcium chloride dissociates into three ions in solution, which contributes to a greater degree of freezing point depression.
0.15 M NaCl: This solution has a lower concentration of solute particles compared to CaCl2, but still has a significant effect on the freezing point of the solution.
0.1 M Na3PO4: This solution contains a polyatomic ion, which dissociates into four particles in solution, contributing to a greater degree of freezing point depression than a monatomic ion like NaCl.
0.1 M C2H5OH: This is a molecular solute that does not dissociate in solution, and therefore has a lower effect on the freezing point compared to ionic solutes.
0.01 M CO2: This is also a molecular solute, and has the lowest effect on the freezing point due to its low concentration.
In summary, the solutions can be arranged in order of decreasing freezing points as follows: 0.2 M CaCl2 > 0.15 M NaCl > 0.1 M Na3PO4 > 0.1 M C2H5OH > 0.01 M CO2.
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At 20°C water has a density of 0.998 g/mL and at 70°C its density is 0.978 g/mL. Based on the definition of density, how can you explain this density difference?
The density is described below, the relationship of density and temperature.
What is density ?
How compact or concentrated anything is is determined by its density. Take two boxes as an illustration, one huge and one little. They both weigh the same, though. This indicates that the small box is more dense than the huge box. Additionally, density conveys how crowded or dense something is.
What is temperature?
In the International System of Units (SI), the kelvin serves as the fundamental measure of temperature. K serves as its symbol. For practical purposes, it is frequently convenient to use the Celsius scale, where 0 °C nearly resembles the freezing point of water and 100 °C signifies the boiling point of water at sea level.
Density = mass / volume
There is no change in mass with temperature.
Volume increases with increases in temperature because kinetic energy of molecules increases with temperature. so the molecules are move away from each other.
So, since density is inversely proportional to volume.
As temperature increases, volume increases thus density increases.
Therefore, The density is described above, the relationship of density and temperature.
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The heat of fusion for water is 6.01 kJ/mole and the heat of vaporization for water is 40.7 kJ/ mol, how much energy is needed to melt 22.5 grams of ice?
The heat of fusion for water is 6.01 kJ/mole and the heat of vaporization for water is 40.7 kJ/ mol,7.5125 KJ energy is needed to melt 22.5 grams of ice.
What is heat of fusion ?The enthalpy of fusion is also known as heat of fusion, is the change in its enthalpy resulting from supplying energy, typically heat, to a specific quantity of the substance to alter its state from a solid to a liquid, at constant pressure.
Given:
The heat of fusion for water = 6.01 kJ/mole
The heat of vaporization for water = 40.7 kJ/ mol
Energy = ?
Number of moles of ice = mass / molar mass
Number of moles of ice = 22.5 / 18
= 1.25 moles
Q = number of moles × Hf
= 1.25 × 6.01
= 7.5125 KJ
Thus, 7.5125 KJ energy is needed to melt 22.5 grams of ice.
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In the laboratory, a student adds 14.0 g of manganese(II) nitrate to a 250. mL volumetric flask and adds water to the mark on the neck of the flask. Calculate the concentration (in mol/L) of manganese(II) nitrate, the manganese(II) ion and the nitrate ion in the solution.
[Mn(NO3)2] = ?M
[Mn2+] = ?M
[NO3-] = ?M
The number of moles of 14 g of manganese nitrate is 0.078 moles. Then molarity of the solution is 0.312 M. The molarity of Mn²⁺ in the solution is 0.312 M and the molarity [NO₃⁻] is 0.624 M.
What is molarity ?Molarity of a solution is the ratio of number of moles of the solute to the volume of solution in liters. It is the common term for representing the concentration of a solution.
Molar mass of manganese nitrate = 178.9 g/mol
no.of moles in 14 g = 14/178.9 = 0.078 moles.
then molarity of [Mn (NO₃)₂] = 0.078/0.25 L = 0.312 M.
In one mole of the solution there is one mole of Mn²⁺.
then [Mn²⁺ ] = [Mn (NO₃)₂] = 0.312 M.
One mole of the compound contains 2 moles of the nitrate ions. Hence,
[NO₃⁻] = 2 × 0.312 = 0.626 M.
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An ___________________ that is useful for living in one type of ______________ may be useless in a different environment.
Organisms must live in a place that has the conditions they need to _____________
Organisms generally have adaptations that allow them to survive in one particular ______________.
An adaptation that is useful for living in one type of environment may be useless in a different environment. Organisms must live in a place that has the conditions they need to survive. Organisms generally have adaptations that allow them to survive in one particular enviroment.
What do adaptations in a particular enviroment mean?The expression adaptations in a particular enviroment mean that these traits are only advantageous regarding the enviroment.
Therefore, with this data, we can see that the adaptations in a particular enviroment can be detrimental or beneficial depending on the enviroment.
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The rate constant for this first‑order reaction is 0.0990 s−1 at 400 ∘C. A⟶products After how many seconds will 19.4% of the reactant remain?
The rate constant for this first‑order reaction is 0.0990 s−1 at 400 ∘C. A⟶products, After 14.90 seconds will 19.4% of the reactant remain.
What is first order reaction ?The term first-order reaction is defined as a reaction that proceeds at a rate that depends linearly on only one reactant concentration.
We can use the formula;
0.693/t1/2 = 2.303/tlog (No/N)
Given that t1/2 = 0.693/k
= 0.693/0.0990 s − 1
= 6 seconds
Therefore,
0.693 / 6 = 2.303/t log 1/0.194
0.693/6 = 1.64/t
t = 1.64/0.11
t = 14.90 seconds
Thus, After 14.90 seconds will 19.4% of the reactant remain.
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Be sure to answer all parts. A student is given four solid samples labeled W, X, Y, and Z. All have a metallic luster. She is told that the solids could be gold, lead sulfide (PbS), quartz which is SiO2, and iodine. The results of her investigations are: (a) W is a good electrical conductor; X, Y, and Z are poor electrical conductors. (b) When the solids are hit with a hammer, W flattens out, X shatters into many pieces, Y is smashed into a powder, and Z is not affected. (c) When the solids are heated with a Bunsen burner, Y melts with some sublimation, but X, W, and Z do not melt. (d) In treatment with 6 MHNO3, X dissolves; there is no effect on W, Y, or Z. On the basis of these test results, identify the solids. Sample W Au PbS SiO2 Sample X: Au PbS Sample X: Au PbS SiO2 I, Sample Y: Au PbS SiO2 I2 Sample Z: Au PbS Au PbS SiO2 Sample Z: Au PbS SiO2
It has a metallic sheen that denotes the presence of lead sulphide and gold (Au). However the fact that it is unaffected by a hammer shows that quartz may also be present.
As sample W is an excellent electrical conductor and does not melt when heated with a Bunsen burner, the presented findings of the research indicate that it is gold (Au). When Sample X breaks into several pieces when struck with a hammer and dissolves in 6 MHNO3, it is lead sulphide (PbS). Since Sample Z is unaffected by hammer blows and does not melt when heated with a Bunsen burner, yet does not dissolve in 6 MHNO3, it is a combination of gold (Au), lead sulphide (PbS), and quartz (SiO2). It also exhibits a metallic shine, which denotes the presence of lead sulphide and gold. Nonetheless, the fact that a hammer has no effect on it shows that quartz may also be present.
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Perform the following calculations and report the answer with the correct number of significant figures.
61.2x36?????????????
See question in the picture below , will give brainliest for correct answer
hope it helped .r.a.t.e
According
to
the
balanced
reaction
below,
calculate
the
quantity
of
gas
that
form
when
liquid
completely
reacts:
N₂H₄(l)
→
NH₃(g)
+
N₂(g)
STARTING AMOUNT
The stoichiometry can be used to obtain the parameters about a reaction.
How do you use stoichiometry?The question is incomplete but I will show you how to use stoichiometry to obtain the parameters that concern a reaction.
Here are the steps to use stoichiometry in a chemical reaction:
Write a balanced chemical equation: The first step is to write a balanced equation for the chemical reaction, which shows the correct number of atoms of each element involved in the reaction.
Determine the molar ratio: From the balanced equation, determine the molar ratio of the reactants and products by counting the number of moles of each species. This will give you the conversion factor between the reactants and products.
Choose a reactant or product to work with: Choose the reactant or product that you have information about, either the amount or the concentration.
Calculate the number of moles: Using the amount or concentration of the reactant or product, calculate the number of moles of that species.
Use the molar ratio to calculate the other species: Using the molar ratio determined in step 2, calculate the number of moles of the other reactants or products.
Convert moles to the desired units: Finally, convert the number of moles to the desired units, such as mass, volume, or number of particles.
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Amino acids are represented in Fischer projections and described by D/L or R/S system. To denote amino acids as D or L, firstly they have to be written in Fischer projection, following the given steps:
1. The Fischer projection is denoted by a plus sign in which the acid group is placed on the top.
2. The carbon chain is the backbone of the Fischer projection, thus the side chain groups are placed at the bottom of the plus sign.
3. The vertical lines represent the bonds facing away from you (these are the carbon chain) and they are depicted by dashed wedges.
4. The horizontal lines represent the bonds coming towards you and they are depicted by solid wedges.
5. The position of the amino group determines the configuration of amino acid: If the amino group is on right side then it is D-amino acid, if the amino group is on left side then it is L-amino acid.
That's a good summary of how to represent amino acids in Fischer projections and determine their D/L configuration.
Just to clarify, the orientation of the amino group is actually determined by looking at the lowest chiral center of the molecule, which is usually the alpha carbon (the carbon next to the carboxyl group). If the amino group is on the right side of this carbon in the Fischer projection, it is an L-amino acid; if it's on the left side, it's a D-amino acid. This may seem counterintuitive, but it's because the Fischer projection is actually a 2D representation of a 3D molecule, and the labels "D" and "L" were historically assigned based on the orientation of the molecule in space rather than the orientation on paper.
Additionally, the R/S system is a different method of assigning absolute configuration (not D/L) to chiral centers in molecules, including amino acids. In this system, the orientation of the groups around the chiral center are ranked by priority (based on atomic number), and the molecule is oriented so that the lowest priority group is pointing away from the viewer. The remaining three groups are then prioritized in a clockwise or counterclockwise direction, and the molecule is assigned an R or S configuration based on the direction of the priority sequence.
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Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below.
2NaClO3 --> 2NaCl +3O2
How many moles of O2 were produced by 4 moles of NaClO3? Round your answer to the nearest whole number.
Answer:
16 moles
Explanation:
Since we have the ratios of the substances' molar masses, we can just calculate using those. We know that our end product has 3 grams of oxygen; our equation shows that the end product has 3O2 after decomposition, so we can compare how much oxygen we have to how much 3O2 would weigh if we had whole moles of substance.
3O2 would be six moles and weigh 96 grams. Since we only actually have 3 grams, we know that we are working with 3 / 96 = 1/32 of a mole per substance. Now, we look at the equation again, and multiply the ratio of each substance by 1/32, and then by the molar weight. All that's left is finding the importance of the Sodium and the Chlorine, both of which are prevalent in a ratio of 2, so we take 2/32=1/16 of each substance and multiply by their molar weights; 23/16 grams of Sodium, and 35.5/16 grams of Chlorine. Adding those together, we have 58.5/16 grams, which we can round to 64/16, or 4. Adding those 4 grams to the 3 grams of oxygen that the problem gives us, we have seven grams of Sodium Chlorate necessary to give us 3 grams of oxygen post-decomposition.
Answer:
Explanation:
From the given equation, for every 2 moles of NaClO3, 3 moles of O2 are produced.
So, for 4 moles of NaClO3:
4 moles NaClO3 / 2 moles NaClO3 = 2
Therefore, 2 * 3 moles O2 = 6 moles O2.
So, 4 moles of NaClO3 will produce 6 moles of O2.
What mass of silver nitrate will react with 5.85 g of sodium chloride to produce 14.35 g of silver chloride and 8.5 g of sodium nitrate
17g is the mass of of silver nitrate will react with 5.85 g of sodium chloride to produce 14.35 g of silver chloride and 8.5 g of sodium nitrate.
What is silver nitrate?Silver nitrate is indeed a chemical compound having the formula AgNO[tex]_3[/tex]. It serves as a flexible precursor to a wide range of other silver compounds, including those employed in photography.
It is significantly less light sensitive than halides. It was originally known as lunar caustic because ancient alchemists connected silver with both the moon and termed it luna.
According to law of conservation of mass
Total mass of reactants = Total mass of products
Mass of Silver nitrate + 5.85g= 14.35g+ 8.5g
Mass of silver nitrate = 22.85-5.85= 17g
Therefore, 17g is the mass of silver nitrate.
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For the following equation, assume you started with 15.6g potassium (K). How many moles of potassium oxide would be produced assuming you had unlimited oxygen? ____ K + ____ O2 → _____ K2O
According to the stoichiometry of the given chemical equation, 0.2 moles of potassium oxide would be produced assuming you had unlimited oxygen.
What is stoichiometry?Stoichiometry is defined as the determination of proportions of elements or compounds in a chemical reaction. The relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
In the given equation,156 g potassium gives 188.4 g potassium oxide, thus, 15.6 g will give 15.6×188.4/156=18.84 g potassium oxide which is 18.84/94.2= 0.2 moles.
Thus, 0.2 moles of potassium oxide would be produced assuming you had unlimited oxygen.
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An aqueous solution containing 35.3 g of an unknown molecular (non-electrolyte) compound in 148.5 g of water was found to have a freezing point of -1.2°C.
Calculate the molar mass of the unknown compound.
The molar mass is 370 g/mol.
What is the freezing point?The freezing point is the temperature at which a substance changes from a liquid to a solid state. This change of state occurs when the thermal energy of the substance decreases to the point where the molecules can no longer move freely and instead become organized in a fixed, solid structure.
We know that;
ΔT = K m i
ΔT = Freezing point depression
K = freezing constant
m = molality
i = Van't Hoff factor
Thus;
Molality = 35.3/M/148.5 * 10^-3
Where M is the molar mass
Then;
ΔT = Freezing point of pure solvent - Solution
= 0 - (-1.2°C) = 1.2°C
Thus;
1.2 = 1.86 * 35.3/0.148 M * 1
1.2 * 0.148 M = 1.86 * 35.3
M = 1.86 * 35.3/1.2 * 0.148
M = 65.658/0.1776
M = 370 g/mol
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Explain why phosphorus is a non-conductor of electricity.
What are the different modes of reproduction in organisms, such as asexual and sexual reproduction?
Answer:
Asexual reproduction is a mode of reproduction that occurs without the involvement of sex cells or meiosis. In this type of reproduction, a single organism produces offspring that are genetically identical to the parent. This can happen through methods such as budding, fragmentation, and self-fertilization.
Sexual reproduction, on the other hand, involves the fusion of gametes or sex cells from two different organisms to produce offspring that have genetic material from both parents. This results in offspring with a unique combination of traits and genetic diversity. Some common examples of sexual reproduction include the exchange of sperm and eggs in animals, and the fusion of male and female gametes in plants.
Explanation:
Defend the argument that creep feeding is beneficial to newborns.
Answer:
Creep feeding can help them make the transition without such a setback, and it can also help them begin to produce the enzymes needed to digest nonmilk proteins.
Explanation:
The minimum amount of ammonium carbonate that reacts to produce 1.0 mole of ammonia is
48 gm is the minimum amount of ammonium carbonate that reacts to produce 1.0 mole of ammonia.
What is ammonium carbonate?The chemical formula for ammonium carbonate is (NH₄)[tex]_2[/tex]CO₃. It is employed as a souring agent as well as smelling salt because it easily degrades to gaseous carbon dioxide and ammonia when heated.
It is also called as cook's ammonia and was the forerunner of the contemporary leavening ingredients baking soda as well as baking powder. It is a constituent of what was previously known called sal volatile as well as salt of hartshorn, and when cooked, it has a strong odor.
(NH₄)[tex]_2[/tex]CO₃ → 2 NH₃ + CO₂ + H₂0
2 moles of ammonia are produced from 1 mole of ammonium carbonate. 0.5 moles of ammonium carbonate will be needed to produce 1 mole of ammonia.
Mass = moles × molar mass
= 0.1 mol × 96.09 g/mol
= 48 gm
Therefore, 48 gm is the minimum amount of ammonium carbonate that reacts to produce 1.0 mole of ammonia.
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The burning of 18.0 g of carbon produces 55.0 g of carbon dioxide. What is the theoretical yield of CO2? Then, calculate the percent yield of CO2. C + O2 → CO2
Theoretically, carbon dioxide can be produced by multiplying 0.139 moles of glucose by 6 moles of carbon dioxide per mole of glucose, which results in 0.834 moles of carbon dioxide.
What yield qualifies as theoretical?The theoretical yield of a chemical reaction is the volume of a product that is produced when a limiting reactant is completely converted. Because it indicates the product amount that would result from a perfect (theoretical) chemical reaction, it is not the same as that of the quantity that would actually acquire from a reaction in the lab.
What is the theoretical formula?Calculate its molar mass of a element by the weight of the compound, then multiply the result by 100 to determine the theoretical proportion of the element in the compound. The actual yield of a product in a chemical reaction is calculated by dividing it by the theoretical yield and multiplying the result by 100.
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