Answer
The mass of C4H10 needed = 28 grams
Explanation
Given:
The mass of carbon dioxide formed = 85 grams
What to find:
The mass of C4H10 needed to form 85 grams of CO2.
Step-by-step solution:
Step 1: Write the balanced equation for the reaction.
[tex]2C_4H_{10}+13O_2\rightarrow8CO_2+10H_2O[/tex]Step 2: Convert 85 grams of CO2 formed into moles.
Using the atomic masses of C and O from the periodic table; the molar mass of CO2 = 44.01 g/mol.
So, the moles of CO2 in 85 grams CO2 can be calculated using the mole formula
[tex]\begin{gathered} Moles=\frac{Mass}{Molar\text{ }mass} \\ \\ Moles\text{ }of\text{ }CO_2=\frac{85\text{ }g}{44.01\text{ }g\text{/}mol}=1.931379232\text{ }mol \end{gathered}[/tex]Step 3: Determine the moles of C4H10 needed.
Using the mole ratio of C4H10 to CO2 in step 1 and the moles of CO2 formed in step 2; the moles of C4H10 needed is calculated as shown below.
[tex]\begin{gathered} 2mol\text{ }C_4H_{10}=8mol\text{ }CO_2 \\ \\ x=1.931379232mol\text{ }CO_2 \\ \\ Cross\text{ }multiply\text{ }and\text{ }divide\text{ }both\text{ }sides\text{ }by\text{ }8mol\text{ }CO_2 \\ \\ x=\frac{1.931379232mol\text{ }CO_2}{8mol\text{ }CO_2}\times2mol\text{ }C_4H_{10} \\ \\ x=0.482844808\text{ }mol \end{gathered}[/tex]Step 4: Convert the moles of C4H10 in step 3 above to grams.
From the periodic table, the molar mass of C4H10 can be determined to be = 58.12 g/mol.
Using the same mole formula used in step 2, the mass of C4H10 is
[tex]\begin{gathered} Mass=0.482844808mol\times58.12g\text{/}mol \\ \\ Mass\text{ }of\text{ }C_4H_{10}=28.06294024\text{ }grams \\ \\ Mass\text{ }of\text{ }C_4H_{10}\approx28\text{ }grams \end{gathered}[/tex]Therefore, the mass of C4H10 needed to form 85 grams of carbon dioxide is 28 grams
Formation of Precipitation
2. Water vapour moves into air where it condenses and forms clouds. Water reacts with gaseous carbon dioxide
in the atmosphere to form an aqueous solution of carbonic acid.
a) Write out the WORD EQUATION for this reaction.
b) Write out the BALANCED CHEMICAL EQUATION for this reaction.
The word equation:
carbon dioxide (g) <======> carbon dioxide(aq)
carbon dioxide(aq) + water ========> carbonic acid(aq)
The balanced chemical equation
CO2(g) <=========> CO2(aq)
CO2 + H20 =========> H2CO3(aq)
Describe precipitation.Precipitation is any liquid or frozen water that condenses in the atmosphere and falls to the earth. Snow, sleet, and rain are only a few of its many forms. Along with evaporation and condensation, precipitation is one of the three major processes that make up the global water cycle.
Precipitation is created when water vapor in clouds condenses into progressively larger droplets of water. When the drops are heavy enough, they eventually reach the Earth. If a cloud is cooler, as it would be at higher elevations, the water droplets may freeze to generate ice. These ice crystals eventually fall to the Earth as snow, hail, or rain, depending on the temperature both inside the cloud and at the surface.
The word equation:
carbon dioxide (g) <======> carbon dioxide(aq)
carbon dioxide(aq) + water ========> carbonic acid(aq)
The balanced chemical equation
CO2(g) <=========> CO2(aq)
CO2 + H20 =========> H2CO3(aq)
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What is the scientific method?
OA. A set of rules that all scientists need to follow
OB. A set of steps that help scientists gather knowledge
OC. A way for scientists to prove that their theories are correct
O D. A way for scientists to come up with questions about the world
Answer:
B: A set of steps that help scientists gather knowledge.
Explanation:
It's a series of steps that starts with an observation and ends with a Report/conclusion. The others don't make sense.
Please give brainliest!!
Question 1What is the mass of 11.52mol of particles ofCalcium Chloride (CaCl₂)? (Round any atomicmass from the periodic table to one decimal
Explanation:
First let's find the molar mass of CaCl2:
Ca = 40.1 g/mol
Cl = 35.5 g/mol
40.1 + (35.5*2) = 111.1 g/mol
So:
111.1 g ---- 1 mol
x g ---- 11.52 mol
x = 1,279.872 g
Answer: 1,279.9 g
12
32. How many grams of ice at 0°C can be melted by the condensation of 12.39 g of steam at 100°C,
assuming a complete transfer of thermal energy?
Number 32
Mass of ice that will produce by ice at 0°C which can be melted by the condensation of 12.39 g of steam at 100°C, will be 16.1 grams
How to find mass of ice?A body's mass is always constant. Mass can be calculated in one of two ways: mass = volume density. The gravitational force acting on a mass is measured by weight. "Kilogram" is the SI unit of mass.
We know, that
Q = mcΔT
Heat gained by the ice = Heat loss by the steam
Mass of ice = m
Specific heat of ice (c) = 2.093 kg/kg- k
T= 293k
Mass of steam = 12.399
0.0129
Specific heat of vapor = 1.996 kJ/kg k
T = 393k
Now,
m*2.093*273 = 0.01239*1.996*373
m = 0.01239*1.996*373/2.093*273
Mass of ice in grams = 0.0161*1000
Mass of ice = 16.1 grams
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Given that carbonic acid, H2CO3, has a pKa1 = 6.37 and a pKa2 = 10.33, answer the following.
Given that carbonic acid, H₂CO₃, has a pKa1 = 6.37 and a pKa2 = 10.33, if you want to make pH 7 buffer solution starting with NaHCO₃ , we add 0.10M HCL .
a) NaHCO₃ is salt of weak acid and a strong base . the initial pH is greater than 7 means it is basic and we should add 0.10 M HCL to the pH which is 7.
Thus, Given that carbonic acid, H2CO3, has a pKa1 = 6.37 and a pKa2 = 10.33, if you want to make pH 7 buffer solution starting with NaHCO₃ , we add 0.10M HCL .
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How many molecules are in 2.6 g of H2O
According to the solution is 8.671 x 10²³ molecules are in 2.6 g of H₂O.
What are molecules and examples?A molecule is the smallest unit of any material that is composed of one or more elements and is capable of existing independently while maintaining all of the substance's physical and chemical properties. Further atom division occurs within molecules. For example, the symbol for the oxygens and molecule are O and O2, etc.
Briefing:The two hydrogen atoms in one gram of water weigh 2 atomic units (au) while an oxygen atom weighs 16 au. Water therefore has a molar mass of 18 au. This indicates that 18 grams equal 1 mole of water.
1 mole = 18 grams
x moles = 2.6 grams
Therefore x = (2.6x1)/18 = 0.144 moles.
1 mole contains 6.022141 x 10²³ particles
We have 0.144 moles, so:
0.144 x 6.022141 x 10²³ = 8.671 x 10²³ molecules.
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If mℓ=4, what can be said about ℓ?
The ℓ = [tex]\leq 4[/tex]
How are mℓ and ℓ related ?A milliliter is a more compact metric unit that measures a liquid's volume or capacity. It is equivalent to one thousandth of a liter and is used to measure lesser amounts of liquid (1 liter = 1000 milliliters). The conversion factor from liters to milliliters is 1 litre = 1,000 milliliters. Use the converter below to change the value of l to ml to your own. Use the volume conversion tool for other volume conversions. We now understand that one liter is equal to one thousand milliliters. Therefore, we double or divide the quantity by 1000 to translate from milliliters to liters or from liters to milliliters.We increase the amount by 1000 to convert a larger unit (the liter) to a smaller one (the milliliter).To learn more about mℓ and ℓ refer :
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Determine the quantity of nitrogen atoms in 15.0
grams of Pb(NO₂)2
Answer: 6.04 x 10^22 N atoms
Explanation:
Molar mass Pb(NO2)2 = 299.21 g
Avogadro constant: 6.022 x 10^23
(15 g Pb(NO2)2)/299.21 g/mol * 2 = 0.100264028 mol of Nitrogen
0.100264028 mol of Nitrogen * (6.022 x 10^23 atom) = 6.04 x 10^22 Nitrogen atoms
What is the mass (in grams) of 1.45 mol BaBr2?
Please include how to get answer if possible.
According to the mole concept, the mass in grams of 1.45 mole of barium bromide is 430.853 g.
What is mole concept?Mole concept is a concept according to which mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
Number of moles is calculated by the formula, :mass/molar mass
So for the given problem mass=number of moles×molar mass
=1.45×297.14=430.853 g
Hence, 430.853 g is the mass of 1.45 moles of barium bromide.
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According to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to another?
1. The volume and the shape stay the same.
2. The volume increases to fill the new container, but the shape stays the same.
3. The volume stays the same, but the shape changes to fit the new container.
4. The volume and the shape change to fill the new container.
According to the kinetic-molecular theory, if a liquid is transferred from one container to another, the volume stays the same, but the shape changes to fit the new container.
What is the kinetic-molecular theory?The kinetic theory of gases is a simple, historically significant classical model of the thermodynamic behavior of gases, with which many principal concepts of thermodynamics were established.
The kinetic-molecular theory is based on some assumptions which includes:
Gases are composed of a large number of particles that behave like hard, spherical objects in a state of constant, random motion.These particles move in a straight line until they collide with another particle or the walls of the container.These particles are much smaller than the distance between particles. Most of the volume of a gas is therefore empty space.Learn mote about the kinetic-molecular theory at: https://brainly.com/question/134712
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The volume of a block of wood is 16 cm3. What is the volume in cubic meters?
The volume in cubic meters is 4096m.
To calculate the volume or volume of an object or room in cubic feet measure the length, width, and height in feet and multiply length x width x height. The volume of an object is the amount of space it fills. Large capacity is measured in cubic meters m3. Smaller volumes are measured in cubic centimeters cm3 or cubic millimeters mm3.
Board foot is the most commonly used standard in lumber and lumber. One foot of board is equivalent to 144 cubic inches of lumber, or a board 1 inch thick, 12 inches wide, and 1 foot long. The second unit of measure is code. The volume of a box can be calculated as length x width x height. Taking a single-layer box as an example 102 x 102 x 102 is equivalent to 1,061,208 cubic millimeters. In metric units, volume is usually expressed in millimeters and liters.
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Write down at least ten changes that you observe in the world around you. W
changes involve chemistry? Explain your reasoning.
Burning, frying, rusting, and rotting are a few instances of chemical transformations. The physical transformations of boiling, melting, freezing, and shredding are a few examples. If enough energy is provided, many physical changes can be reversed. A different chemical reaction is the only way to undo a chemical change.
What are chemical changes?Changes in temperature, odor, color, precipitate or gas formation, and precipitate or gas formation.Burning, frying, rusting, and rotting are a few instances of chemical transformations. The physical transformations of boiling, melting, freezing, and shredding are a few examples. If enough energy is provided, many physical changes can be reversed. A different chemical reaction is the only way to undo a chemical change.Chemical transformations occur when two or more components are mixed to create a brand-new compound. You have a new material after a chemical transformation. A chemical change might occur when burning paper or when baking a cake. The three oxygen atoms that make up ozone form an inert gas.To learn more about : Chemical change
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The solubility of Zn3(PO4)2 is 3.4 x 10^-8 mol/L, what is its Ksp? a) 49b) 4.9 x 10^36c) 4.9d) 0.49e) 4.9 x 10^-36
Answer
The dissociation of
Zn₃(PO₄)2
A 1.7 L coffee thermos is at a pressure of 1.2 atm and a temperature of 20ºC. Hot coffee is added to the thermos and it reduces the volume of gas to 1.1 L and increases the temperature to 90ºC. What is the new pressure in the coffee thermos?
1) List the known and unkown values
Initial conditions
Volume: 1.7 L
Pressure: 1.2 atm
Temperature: 20ºC
Final conditions
Volume: 1.1 L
Temperature: 90ºC
Pressure:
2) Set the equation
[tex]\frac{P1V1}{T1}=\frac{P2V2}{T2}[/tex]3) Convert Celsius to Kelvin
[tex]K=ºC+273.15[/tex]Initial temperature
[tex]K=20ºC+273.15=293.15\text{ }K[/tex]Final temperature
[tex]K=90ºC+273.15=363.15\text{ }K[/tex]4) Plug in the known values
[tex]\frac{(1.2\text{ }atm)*(1.7\text{ }L)}{293.15\text{ }K}=\frac{(P2)*(1.1\text{ }L)}{363.15\text{ }K}[/tex].
[tex](\frac{(1.2\text{ }atm)*(1.7\text{ }L)}{293.15\text{ }K})*363.15\text{ }K=(\frac{(P2)*(1.1\text{ }L)}{363.15\text{ }K})*363.15\text{ }K[/tex][tex](\frac{(1.2\text{ }atm)*(1.7\text{ }L)}{293.15\text{ }K})*363.15\text{ }K=(P2)*(1.1\text{ }L)[/tex]
.
[tex](\frac{(1.2\text{ }atm)*(1.7\text{ }L)*(363.15\text{ }K)}{293.15\text{ }K})*\frac{1}{1.1\text{ }L}=\frac{(P2)*(1.1\text{ }L)}{1.1\text{ }L}[/tex].
[tex]P2=\frac{(1.2\text{ }atm)*(1.7\text{ }L)*(363.15\text{ }K)}{(293.15\text{ }K)*(1.1\text{ }L)}=2.297\text{ }atm[/tex]The new pressure in the coffee thermos is 2.3 atm.
.
In a vacuum, all light waves ______.
have the same wavelength.
have the same energy.
have the same speed.
have the same frequency.
In a vacuum, all different types of light waves have the same speed (Option 3).
What are light waves?Light is energy emitted as waves that travel to a given frequency and speed. These light waves emit electricity and magnetism and have the same speed when they are found in space (vacuum).
Light waves can take many different forms which include:
radio wavesmicrowavesinfraredvisible lightUV lightTherefore, with this data, we can see that light waves travel to a given velocity which is the same in equal conditions as occurs in space where conditions are equal.
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what is Keq for the reaction N2+3H2 = 2NH3 if the equilibrium concentrations are NH3 = 3 M, N2 = 1 M, H2 = 2 M
The ammonia formation has been 1.125 mol/L.
Keq is defined as the ratio of the mathematical product of the equilibrium concentrations of the species on the right that is multiplied by the concentrations of the chemical products divided by the mathematical product of the equilibrium concentrations of the species on the left.
This is the reaction that makes ammonia from hydrogen and nitrogen. Only one product is produced in this reaction. This reaction is therefore known as a binding reaction. A small Keq Keq < 1 implies a large concentration of reactants at equilibrium. In this case, the reaction drives the formation of reactants. If Keq ≈ 1 it means that there is a significant amount of reactants and products in equilibrium.
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Keq is equal to the number 4.5
The activation energy for a reaction is the energy difference between what two components of a reaction?
ANSWER
Reactant and intermediate
EXPLANATION
Activation energy is the minimum energy required to activate a chemical reaction
Activated energy is the difference between the reactants and the intermediate
Therefore, the correct answer is option Dm
Calculate the density of a rectangular solid with a mass of 95.5 g, length of 3.55 cm,
height of 250 mm, and width of 0.0175 m.
The density formula is the mass of an object divided by its volume. That is d = m/v.
Density = mass/ volume = 95.5/ 155.312 = 0.615 [tex]g/cm^{3}[/tex].
How do u calculate density?The density formula is the mass of an object divided by its volume. That is d = m/v in equation form, where d is the density, m is the mass, and v is the volume of the object. The standard units are kilograms per cubic meter.The number of units per volume, area, or length: as. a: a substance's mass per unit volume b: the distribution of a quantity (such as mass, electricity, or energy) per unit of space, typically.Density is an important concept because it tells us which substances will float and which will sink when placed in a liquid. Substances float in general if their density is less than the density of the liquid in which they are placed.a rectangular solid with a mass m = 95.5 g,
length = 3.55 cm
height = 250 mm = 25 cm
and width = 0.0175 m. = 1.75 cm
volume of the rectangular solid = 3.55 * 25 * 1.75 =155.312 [tex]cm ^{3}[/tex]
density = mass/ volume = 95.5/ 155.312 = 0.615 [tex]g/cm^{3}[/tex].
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Scientific research in the 1800s revealed that the rate of
infection in surgery patients drastically decreased when
antiseptics were used to clean wounds before procedures.
Which statement best describes the impact of this scientific research?
OA. It had a negative impact on both society and the environment.
OB. It benefited society because it improved humans' understanding of
how infections spread.
OC. It harmed the environment because it led to new agricultural
practices.
OD. It had a positive impact on the environment because it prevented
bacterial growth.
Scientific research in the 1800s revealed that the rate of infection in surgery patients drastically decreased when antiseptics were used to clean wounds before procedures. It benefited society because it improved humans' understanding of
how infections spread.
In our day to day life, various different types and unknown diseases we are facing. This can be due to change in our activities or by using harmful chemicals in industries or may be due to experimental activities in laboratory.
If we use antiseptic before the procedures to clean wounds, it kill the bacteria and other virus and make it clean. This protect us from the upcoming harmful effects of uncleaned wounds.
So, it make us a step towards the healthy and wealthy life.
Thus, we concluded that using antiseptics to clean wounds before procedures. It benefited society because it improved humans' understanding of
how infections spread.
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Calculate the Mass of Iron(III) oxide (rust) produced by the reaction of 500.0g of iron with oxygen from the air.
Explanation:
We have a reaction between iron and oxygen from the air and Iron (III) oxide is produced.
First we have to determine the formulas of our compounds. Iron is a solid and its formula is just Fe. Oxygen is a diatomic gas and its formula is O₂. The formula of iron (III) oxide is Fe₂O₃. Why? Because the oxidation state (or charge) of oxygen in oxides is always 2- and the oxidation state or charge or iron in this case is 3+ (because between brackets we have the number III). Oxides are neutral compounds, if we want to form a neutral compound we will have to:
So the unbalanced reaction is:
___ Fe + ___ O₂ ---> ____ Fe₂O₃
The first step to balance an equation is to determine the number of atoms of each element that we have on both sides.
___ Fe + ___ O₂ ---> ____ Fe₂O₃
Fe: 1 Fe: 2
O: 2 O: 3
We have one atom of Fe on the left side of the equation and 2 atoms of Fe on the right side, so we have to change the coefficient for Fe on the left and write a 2.
2 Fe + ___ O₂ ---> ____ Fe₂O₃
Fe: 2 Fe: 2
O: 2 O: 3
Now Fe is balanced, but O is still unbalanced. We have 3 atoms of O on the right side of the equation and just 2 on the left side. The coefficient for O₂ that balances the equation should be 3/2.
2 Fe + 3/2 O₂ ---> ____ Fe₂O₃
Fe: 2 Fe: 2
O: 3 O: 3
But we can't have fractions as coefficients, they must be entire numbers. So we will have to multiply all the coefficients by 2 to get rid off the fraction.
4 Fe + 3 O₂ ---> 2 Fe₂O₃
Fe: 4 Fe: 4
O: 6 O: 6
Now the equation is balanced.
First, to determine the mass of iron (III) oxide we will have to convert 500.0 g of Fe into moles. To do that we need the molar mass of Fe. Then using the molar ratio between Fe and Fe₂O₃ we can find the number of moles produced. And finally with the molar mass of Fe₂O₃ we can find the mass of Fe₂O₃.
molar mass of Fe = 55.85 g/mol
molar mass of Fe₂O₃ = 159.69 g/mol
mass of Fe₂O₃ = 500.0 g of Fe * 1 mol of Fe/(55.85 g/mol) * 2 moles of Fe₂O₃/(4 moles of Fe) * 159.69 g/mol
mass of Fe₂O₃ = 714.8 g
Answer: the mass of iron (III) oxide produced is 714.8 g
what element is this
Answer:
looking at it,it should be oxygen or Nitrogen.
193 ml of oxygen o2 was collected over water on a day when the atmospheric pressure was 762.0mmHg. The temperature of the water was 23.0C.
The mass of the oxygen that is collected is 0.25 g.
What mass of oxygen was collected?From the question, we have the following information;
pressure of the gas = 762.0mmHg
Vapor pressure of the gas = 21.1mmHg
temperature of the gas = 23.0C or 296 K
Volume of the gas = 193 ml or 0.193 L
We know that the pressure of the oxygen gas is now going to be the volume of the gas minus the vapor pressure at that temperature.
We now have;
762.0mmHg - 21.1mmHg = 740.9 mmHg or 0.97 atm
Now we have;
PV = nRT
n = PV/RT
n = 0.97 atm * 0.193 L/ 0.082 atmLK-1mol-1 * 296 K
n = 0.187/24.3
n = 0.0077 moles
Mass of the oxygen = 0.0077 moles * 32 g/mol = 0.25 g
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Missing parts;
193 mL of O2 gas was collected over water on a day where the atmospheric pressure was 762mmHg. The temperature of the water was 23.0 C, and the vapor pressure of water at this temperature was 21.1mmHg. What is the mass in grams of the oxygen collected?
can someone please help me!
Answer:
Highest voltage is generated by the Ni°|Ni⁺²||Cu⁺²|Cu° Voltaic Cell in the amount of E°(cell) = 0.597 volt.
Explanation:
The standard voltage of a voltaic cell can be calculated using the expression E°(cell) = E°(redn) - E°(oxdn).
The symbology of the voltaic cell is generally shown as
[ Oxdn Rxn || Redn Rxn ].
That is, for the cell Mn°|Mn⁺² || Zn⁺²|Zn° the reduction reactions (as given in the Table of Standard Reduction Potentials) are:
Mn⁺² + 2e⁻ => Mn°; E°(Mn⁺²|Mn°) = -1.17 volts
Zn⁺² + 2e⁻ => Zn° ; E°(Zn⁺²|Zn°) = -0.76 volts
Note => One can search engine 'Table of Standard Reduction Potentials'. A number of citations will be given.
Since in the symbolic cell the order is oxidation rxn || reduction rxn ; the manganese reaction should be reversed and added to the zinc reduction reaction giving the standard net cell reaction, E°(cell). That is ...
Oxidation Rxn: Mn° => Mn⁺² + 2e⁻
Reduction Rxn: Zn⁺² + 2e⁻ => Zn°
Net Cell Rxn: Mn° + Zn⁺² => Mn⁺² + Zn°
Therefore, the Standard Cell Potential for the Mn°|Mn⁺² || Zn⁺²|Zn° cell is ...
E°(cell) = E°(redn) - E°(oxdn) = E°(Zn°) - E°(Mn°) = (-0.76v) - (-1.17v) = 0.41 volt
-----------------------------------------------------------------------------
The cell potentials for the remaining cells are calculated the same way. That is ...
For the Zn°|Zn⁺² || Ni⁺²|Ni° cell
E°(Zn|Ni) = E°(Ni) - E°(Zn) = (0.257v) - (-0.76v) = 0.503 volt, and
For the Ni°|Ni⁺² || Cu⁺²|Cu° cell
E°(Ni|Cu) = E°(Cu) - E°(Ni) = (+0.34v) - (-0.257v) = 0.597 volt (highest voltage)
__________________________________________
NOTE => When using the Table of Standard Reduction Potentials it is useful to remember that the electron flow is always from the more negative voltage to the more positive voltage. That is, the element or polyion with more negative negative voltage is always the oxidation process while the more positive voltage is always the reduction process.
Also, when calculating the Standard Cell Potential the value determined must always be positive. Otherwise, the cell combination shown in the symbolic form will be a no reaction. (Good to know for questions like 'Which of the following will not occur?') That is E°(cell) = E°(redn) - E°(oxdn) > 0.00 volts.
Hope this helps. :-)
When the following equation is balanced, one of the terms of the balanced equation is:
PbO2 → PbO + O2
A.
PbO2
B.
3PbO2
C.
3PbO
D.
O2
Answer:
D
Explanation:
A balanced equation has the same number of atoms for each element on both sides of the equation. It is important for chemical equations to be balanced as only then will it show how the reactants and products are related to each other in terms of mole ratio. The reactants are found on the left-hand side of the arrow, while the products are found on the right-hand side.
In this question, the elements are Pb and O.
Let's count the number of atoms of each element in the unbalanced equation.
Reactant
Pb: 1 atom
O: 2 atoms
Product
Pb: 1 atom
O: 3 atoms
The number of Pb atoms are already balanced, but not the for the O atoms. Note that balancing the O atoms also affects the number of Pb atoms.
2 PbO₂ → 2 PbO +O₂
Now, the equation is balanced with 2 Pb atoms and 4 O atoms on both sides.
Thus, option D is correct.
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What word describes an investigation by the same students which gives similar results each time
Answer:
paiwnwom0sjsnenwksksjnssisn
Explanation:
d ko alam
losing
Atoms become more stable when they achieve lower energy states by ________or_____
electrons.
sharing
cutting
heating
splitting
gaining
magnetizing
Atoms become more stable when they achieve lower energy states by losing or gaining
electrons.
As we know that atoms wants to attain stable configuration either by losing electron or by gaining electron.
Let us take an example of electropositive atom Na, which have 11 as atomic number. It have one electron more than stable electronic configuration. So, it lose one electron and attain stable configuration of Neon.
Similarly, electronegative atom F, which have 9 as atomic number. It have one electron less than stable electronic configuration. So, it gain one electron and attain stable configuration of Neon.
Thus, we concluded that atoms become more stable when they achieve lower energy states by losing or gaining electrons.
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Calculate the pressure (in atm) of a 3.30 mol sample of ammonia gas at 350.0 K in a 3.00 L container using the van der Waals equation. For ammonia, a = 4.17 L2 atm/mol² and b = 0.03712 L/mol.
The pressure (in atm) of a 3.30 mol sample of ammonia gas at 350.0 K in a 3.00 L container using the van der Waals equation is 89.66 atm.
Given that :
n = 3.30 mol
Volume V = 3.00 L
Temperature T = 350.0 K
for ammonia :
a = 4.17 L²atm/mol²
b = 0.03712 L/ mol
Vander waals equation is given as :
( P + an²/V²) ( V - nb ) = nRT
(P + 4.17 × ( 3.30 )² / 3² = 3.30 × 0.082 × 350
P + 5.045 = 94.71
P = 89.66 atm
Thus, The pressure (in atm) of a 3.30 mol sample of ammonia gas at 350.0 K in a 3.00 L container using the van der Waals equation is 89.66 atm.
To learn more about Van der waals equation here
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Units of concentration are grams per 100 mL. What is the concentration of a solution containing Potassium Nitrate (20g in beaker) and 100 mL of water?
Answer: The concentration of solution is, 62.5 g/100 mL
Explanation:
Mass of solute = 25 g
Volume of solvent (water) = 40 mL
Now we have to calculate the concentration of solution.
Now put all the given values in this expression, we get:
Thus, the concentration of solution is, 62.5 g/100 mL
Part 1: Looking at the diagram above, what can you tell me about the type of reaction it is? Is this exothermic or endothermic? How do you know? Make sure you support your answer by using the diagram.
Exothermic reaction
ExplanationsThe given diagram is the diagram showing the change in the heat of the reaction of a substance.
If the enthalpy change is negative, the reaction is exothermic showing that the heat is given out to the surroundings but the enthalpy change is positive, the reaction is exothermic showing that the heat is absorbed from the surrounding.
From the diagram, the energy of the product is C while the energy of the reactant is A.. Since the energy of the product is lower than that of the reactant, hence the change of enthalpy will be expressed as:
[tex]\triangle H=C-A<0:\text{ }\triangle H=-ve[/tex]Since the enthalpy change is negative, the reaction is exothermic showing that the heat is given out to the surroundings.
name the common acid: H2SO4(aq)
Answer & Explanation
Based on the PubChem database readily available online, this acid is called Sulfuric acid
