The molar mass of a substance can be calculated from its density alone if that substance is an element gas at STP liquid or solid
The molar mass of a substance can be calculated from its density alone if that substance is a gas at STP.
What is the molar mass of a substance?The molar mass of a substance is the mass of one mole of that substance.
One mole of a substance is the amount of that substance that contains as many elementary entities as there are in 12 g of carbon-12.
The number of particles in 12 g of carbon-12 is the Avogadro number = 6.03 * 10²³ particles.
One mole of all gases occupies the same volume at STP.
Also, the molar mass of a gas is related to the vapor density of that gas by the formula below;
The molar mass of a gas = vapor density * 2Hence, the molar mass of a gas can be determined from the density of the gas by multiplying the vapor density of the gas. by 2.
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if the balloon had a volume of 39000 l , how many kilograms of hydrogen were needed to fill the balloon at stp?
the amount of hydrogen required was about 0.582kg
why do we require STP?
STP: Standard temperature pressure
Consider a scenario in which a chemist in London is conducting an experiment in a lab. 12 °C and 1.015 bar are the average room temperatures and pressures in London. In Austin, where the average room temperature and pressure are 21 °C and 1.014 bar, respectively, the same experiment could yield very different results. This is due to the fact that temperature and pressure have an impact on a lot of scientific experiments, particularly chemistry experiments. We have therefore adopted some standard operating procedures to prevent these deviations and to ensure that laboratory experiments are conducted in a consistent manner worldwide. STP is one of those norms.
Vm=RT/P
=8.314x273.15/39000
=0.0582
so the balloon requires about 0.0582kg of hydrogen gas
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polonium was discovered in uranium ores by marie and pierre curie. polonium-210 decays by emitting a single alpha particle. what nuclide is formed in this process?
A nuclide is formed in the process [tex]^{206}Pb[/tex].
What is polonium-210?Polonium is а rаdioаctive element thаt occurs nаturаlly in very low concentrаtions in the eаrth’s crust. Mаrie аnd Pierre Curie discovered polonium in 1898 while they were seeking the cаuse of the rаdioаctivity of pitchblende ore thаt contаined urаnium. Polonium in its pure form is а low-melting, fаirly volаtile metаl. Аll polonium isotopes аre rаdioаctive, but most аre very short-lived аnd decаy rаpidly. Only three polonium isotopes lаst for аny аppreciаble аmount of time. Those isotopes аre polonium-208, polonium-209, аnd polonium-210.
Polonium-210 is the predominаnt nаturаlly occurring isotope of polonium аnd the one most widely used. Polonium-210 hаs а hаlf-life of 138 dаys, аnd it decаys to stаble leаd-206 by emitting аn аlphа pаrticle (аn аlphа pаrticle hаs two protons аnd two neutrons).
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2. Suppose you burn magnesium in a limiting amount of oxygen in a closed system,
expecting to get 1.61 g of MgO. You measure only 0.988 g MgO after the reaction.
Show how you would calculate the percent yield for this reaction. (2 pts)
The percentage yield of the given reaction was supposed to be
the formula for the calculation of the percentage yield was =actual yield/theoretical yield X 100
What is percentage yield ?
The percent yield equation is as follows:
(actual yield/theoretical yield) x 100% Equals percent yield
Where: actual yield is the quantity of product received from a chemical reaction theoretical yield is the amount of output obtained from the stoichiometric or balanced equation, utilizing the limiting reactant to calculate product (moles or grams).
The quantity of products generated from a chemical reaction is referred to as the real yield. The theoretical yield is the quantity of product calculated from the stoichiometric or balanced equation utilising the limiting reactant to determine product.
=(0.988/1.61) X 100
=61.36%
the percentage yield of the reaction was found to be 61.36%
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What was the initial volume of a gas that had an initial temperature of 20.65 C if it reached a final temperature of 41.77 C and final volume of 16.14 L.
If a gas had an initial temperature od 20.65 C and a final temperature of 41.77 C, its initial volume would be 7.979.
How are volume and example used?The volume of any solid in three dimensions is equal to the area it occupy. These solids include shapes like a cube, cuboid, conical, cylinder, and sphere. The form affects how much volume there is.
What does a gas' volume mean?The space occupied by the gaseous particles under typical pressure and temperature circumstances is referred to as the volume of gas. It has the symbol "V." The symbol for volume in the SI is "liters," or "L". When the gas is at normal temperature, a mole has a volume of 24 m3, or 24 000 cm3. The molar volume of a gas is this quantity.
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15. The figure shows a reaction. What type of reaction is shown?
a. Synthesis
b. Decomposition
CSingle replacement
d. Double replacement
e. Combustion
Cl cu cl —> Cu+ClCl
if 2.50g of the organic fuel was reacted with 2.50g of oxygen and 1.00g of water was actually produced, what is the percent yield of this reaction?
The percent yield would be 40% if 2.50g of the organic fuel was reacted with 2.50g of oxygen and 1.00g of water was produced.
How is the percent yield of an organic molecule determined?
The percentage yield is a figure generated to represent the discrepancy between an experiment's theoretical and actual yields. There are by-products and desired products while experimenting with various solutions or producing chemical solutions.To calculate the yield percentage: Multiply by 100 after dividing the actual yield obtained in the lab by the estimated theoretical yield.For instance, your percent yield would be as follows if you started with 100 grams of compound A and produced 80 grams of product B: 80% yield is equal to (80 grams B / 100 grams A) × 100.To learn more about percent yield, follow the link https://brainly.com/question/12704041
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Compare the structure and bonding of three compounds
Carbon dioxide, magnesium oxide, silicon dioxide
A solid with a covalent network is silicon dioxide. Carbon dioxide is a covalent molecule, whereas magnesium oxide is an ionic substance.
It is a covalent molecule, carbon dioxide. Although the complex has polar C-O bonds, it is often nonpolar, therefore the molecules are only held together by modest dispersion forces.
Ionic solids include the substance magnesium oxide. It has a crystal lattice made up of magnesium ions and oxygen ions. The chemical is almost insoluble in water because of the significant lattice energy and small ion sizes.
Chains of silicon-oxygen bonds make up the covalent network solid known as silicon dioxide. The network solid has a high melting point and creates a very stiff structure.
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.How many moles are present in 5.67x1025 atoms of Carbon (C)?
Answer:
About 94
Explanation:
(1× 5.67×10²⁵)/6.03×10²³
94.03 moles of Carbon
About 94
What is the reduced element of H2O2 + PbS = PbSO4 + H2O
Answer:
4H₂O₂ + PbS = PbSO₄ + 4H₂O
1. Which of the following gas samples contains the largest number of molecules?
(A) 12 g of He (molar mass=4)
(B) 14 g of N₂ (molar mass=28)
(C) 34 g of NH3 (molar mass= 17)
(D)88 g of CO₂ (molar mass = 44)
The molar mass of the gas samples must be known to find the greatest concentration of molecules.
What is a molar mass?
A substance's molar mass is its mass in grams per mole of the chemical. A mole measures a substance's quantity of atoms, molecules, or ions. A mole is 6.022 1023 molecules of any given chemical.
Molar Mass calculation formula
M=m/n
M= molar mass
m=mass of substances (in grams).
n= number of moles of a substance.
How is molar mass determined, and why is it important?
One mole of material is weighed to determine its molar mass. Add the masses of all the components in a molecule to determine the molecular mass of the molecule by multiplying the subscript (number of atoms) by the atomic mass of each element in the molecule.
Using the molar mass formula,
M= 12/4 = 3,
It can be determined that 3 moles (or 3*avogadro number of molecules) are present.
Hence we can conclude that option (a) is correct.
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why is longitudinal diffusion a more serious problem in gas chromatography than in liquid chromatography?
The longitudinal diffusion a more serious problem in gas chromatography than in liquid chromatography because the diffusion coefficient is much more larger in gas than the liquid.
What is Chromatography?Chromatography is a type of laboratory technique which is performed for the separation of the mixture of different elements into its components. The mixture firstly dissolved in a fluid solvent which is known as the mobile phase, that carries it through a system at which the material called the stationary phase is fixed.
Not all molecules present in the same solute show same behavior. Different molecules show different behaviour. This is due to mainly three reason which arr given as below:
Resistance to the transfer of matter. Longitudinal diffusionSwirl diffusionThe molecules of solute moves in different direction in the stationary phase, it is due to porosity of the particle that form it.
Thus, we concluded that the longitudinal diffusion a more serious problem in gas chromatography than in liquid chromatography because the diffusion coefficient is much more larger in gas than the liquid.
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why were alpha particles the only radioactive particle that could have been used in rutherfords gold foil experiment
Alpha particles are the only radioactive particle that could have been used in the Rutherford gold foil experiment because they are produced naturally by radioactive nuclides that are alpha emitters and so a steady supply was easy to obtain.
As alpha particles do not travel very far from their radioactive source. They cannot pass through a piece of paper, clothes, or even the layer of dead cells which normally protects the skin.
Rutherford used alpha particles in his gold foil experiment in part because his previous research on radioactive decay discovered alpha particles. He wanted to test how alpha particles, which are positively charged, would react with various forms of matter.
Therefore Rutherford uses alpha particles in the Rutherford gold foil experiment.
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which isotope, when bombarded with oxygen-18, yields the artificial isotope seaborgium-263 plus 4 neutrons?
Californium -249 is the isotope, when bombarded with oxygen-18, yields the artificial isotope seaborgium-263 plus 4 neutrons.
Californium is a radioactive chemical element with the symbol Cf and atomic number 98. The element was first synthesized by bombarding curium with alpha particles (helium-4 ions).
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what are the products for the balanced reaction of hydrochloric acid (hcl) and magnesium hydroxide (mg(oh)2)
The products for the balanced reaction of hydrochloric acid (HCL) and magnesium hydroxide (mg(oh)2) are salt (magnesium chloride ) and water.
The balanced equation is:
[tex]Mg(OH) _{2}+2HCl - MgCl_{2}+2H_{2} O[/tex]
What happens when magnesium hydroxide reacts with HCl?
The reaction between magnesium hydroxide and hydrochloric acid is an example of a neutralization reaction. The hydroxide and hydrogen ions will combine to form water. The remaining ions combine to produce the salt of neutralization. The salt is magnesium chloride.Does magnesium hydroxide dissolve in HCl?
Magnesium Hydroxide is soluble in dilute hydrochloric acid.
Thus, products obtained from the reaction are salt and water.
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(a) how many milliliters of 0.155 m hcl are needed to neutralize completely 45.0 ml of 0.101 m ba(oh)2 solution?
29,322 milliliters of 0.155m hcl are needed to neutralize completely 45.0 ml of 0.101m ba(oh)2 solution Given that :
Hcl + Ba(oh)2 gives Bacl2 + 2h20
Molarity = mole of solute / volume of solution in liters
Molarity = 0.101 m
Volume = 45 ml
mole of solute (ba(0h)2) = Molarity * volume
= 0.101 * 45 ml
= 4.545
now we have to find the volume of hcl so,
again
molarity = mol solute/ volume of solution
volume of solution = mole solute / molarity
= 4.545 / 0.155m
= 29. 322 liters
= 29,322 ml
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if you overshoot the endpoint of a titration in this experiment, it means you added too much of the titrant (naoh). if this happens without realizing it, and you measure the volume of naoh you added, what will happen to the value you calculate for the concentration of naoh?
The value calculated by using excess if NaOH by overshooting endpoint during titration will be not correct.
The value of concentration is supposed to change when excess of NaOH is used. it will be little too high than the correct value. Thus, titration require precise values. Overshooting the endpoint will result in a calculation error for the solution that is being titrated. The calculation for the titrated solution will be off if the moles of titrant are incorrect because the volume of titrant is incorrect because it is higher than it should be.
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Is boiling or evaporation of water more common on earth
sodium bicarbonate is often used as an antacid to neutralize excess hydrochloric acid in an upset stomach. how much hydrochloric acid in grams can be neutralized by 3.5 g of sodium bicarbonate?
781 g of hydrochloric acid in grams can be neutralized by 3.5 g of sodium bicarbonate.
To find out how much hydrochloric acid in grams can be neutralized by 3.5 g of sodium bicarbonate, we need to know the number of moles of HCl present, then multiply that by the molar mass of NaHCO3.
First, we calculate the number of moles of HCl present by solving for x:
x = Moles x 0.1 mol/L
= (Moles)(0.1 mol/L)(1000 mL)
= 100 mmol
Next, we multiply this number by the molar mass of NaHCO3:
=(84.007 g/mol)x(78.129 g/mol)
= 7.8129 x 100 mmol
= 781 g
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In the following reaction:
2 NaClO4 → 2 Na + Cl2 + 4 O2
How many moles of O2 will be produced when 15.6 moles of NaClO4 decompose?
Answer:
31.2 moles of O2
Explanation:
You have to do stoichiometry to convert moles of NaClO4 to moles of O2.
You have 15.6 moles of NaClO4, you need these to cancel out so you use your coefficient from the equation. Since you are trying to find moles of O2 you put your coefficient of oxygen in the numerator. Multiply across the top & divide by the bottom to get 31.2 moles of O2.
[tex]\frac{15.6 mol NaClO4}{1} * \frac{4 mol O2}{2 mol NaClO4}[/tex]
hydroxide ion is a stronger nucleophile than either water or ethanol, yet the addition of koh during the kinetic runs in this experiment has virtually no effect on the reaction rates. explain.
catalytic process, A Ni catalyst is required for amide and alcohol to make the right esters. hydroxide ion is a stronger nucleophile than either water or ethanol,
In general, catalytic activity is a chemical interaction between a catalyst and a reactant that yields chemical intermediates more readily able to react with one another or with another reactant to yield the desired end product. Catalysis is the process of accelerating a chemical reaction by adding a catalyst to it. Catalysts are unaffected by and are not destroyed by the reaction.
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does a reaction occur when aqueous solutions of potassium nitrate and copper(ii) sulfate are combined?
Yes, the reaction between aqueous solutions of potassium nitrate and copper(ii) sulfate happens when they are combined giving products by a reaction called double displacement reaction.
What is double displacement reaction?
Double displacement reaction is also called as double displacement exchange. This happens when some parts of 2 ionic compounds which are reacting are exchanged between them, making 2 new compounds. The positive and negative ions swap their places between the reactants in this reaction.
The reaction between aqueous solutions of potassium nitrate and copper(ii) sulfate give 2 products that is copper nitrate and potassium sulfate. This reaction is known as double displacement reaction.
Balanced chemical equation:
2KNO3 + CuSO4 ----> Cu(NO3)2 + K2SO4
Therefore, the reaction between aqueous solutions of potassium nitrate and copper(ii) sulfate is possible and it gives products like copper nitrate and potassium sulfate making it a double displacement reaction.
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One mitigating strategy for ______________ is______________. I learned that people need to do _____________to mitigate the effects of___________
Answer:
One mitigating strategy for planning and zoning is to protect people and the environment from the nuisance impacts of facilities like landfills, sewage treatment plants and factories through land use planning tools. I learned that people need to Reduce greenhouse gas emissions through their food choices to mitigate the effects of using Renewable energy.
if oxygen nitrogen and ozone did not absorb uv radiation, what would be the temperature profile in the atmosphere
If Ozone does not absorb UV radiation the temperature would rise enormously and the life on planet will be at risk.
This is because the Ozone layer covers the Earth and has the foremost function of absorbing and trapping the incoming UV and IR radiations, which if not absorbed can heat up the planet thereby increasing its overall temperature.
The non-entrapment of UV,IR rays will be futile to the biological contents of Earth and even cause fatalities to the abiotic components of the planet .Observations have shown that the increase in emission of greenhouse gases like Carbon dioxide, methane and synthetic chemicals like CFCs disrupted the Ozone layer eventually affecting the climate.
Ozone damage impact the climate primarily by fluctuating the temperature. The more ozone in a given quantity of air, the more heat it traps. Ozone generates heat in the stratosphere, both by absorbing the sun's UV radiation and by absorbing IR radiation from the lower layer of atmosphere.
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How many equivalence points will a titration between sodium hydroxide and acetic acid have?.
A titration between sodium hydroxide (NaOH) and acetic acid (CH₃COOH) will have two equivalence points. The first equivalence point will be when the acid is completely neutralized, and the second will be when the base is completely neutralized.
The first equivalence point occurs when the moles of sodium hydroxide (NaOH) is equal to the moles of acetic acid(CH₃COOH). In the titration sodium hydroxide has neutralized all of the acetic acid. The second equivalence point occurs when the moles of sodium hydroxide is equal to the moles of water. The reason for two equivalence points is that acetic acid is a weak acid and water is a strong base.
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There are many theories about how life was formed on Earth.
Suggest one reason why there are many
the solubility of n2 gas in blood is 6.1e-4 when the partial pressure of n2 gas is 1 atm and the temperature is 37 c if a scruba diver breathes compressed air with a total air pressure of 3 atm what is the solubility of n2 in her blood
The partial pressure of nitrogen gas is 1.43 x 10^-3 M to be exact, but we can also consider it as 1 atm.
Partial pressure can be defined as- if a container filled with more than one gas, each gas exerts pressure. The pressure of anyone gas within the container is called its partial pressure.
As we know, pressure is the force per unit area. Partial pressure can be the pressure half-filled the area.
Ideal gas behavior allows gas mixtures to be specified simply. In particular, the ideal gas law holds for each component of the mixture separately. Each component exerts its own pressure referred to as its partial pressure.
Partial pressure is the measure of the thermodynamic activity of gas molecules. The gasses diffuse and react based on their partial pressures and not concentrations in a gaseous mixture.
Complete question: -
The solubility of N2 gas in blood is 6.10 x 10^-4M when the partial pressure of N2 gas is 1.00 atm and the temperature is 37-degree C. If a scuba diver breathes compressed air with a total air pressure of 3.00 atm, what is the solubility of N2 in her blood?
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1.00 mol of calcium hydroxide has how many oxygen atoms? the formula for calcium hydroxide is ca(oh)2.
1.00 mole of calcium hydroxide has 1.20 × [tex]10^{24}[/tex] atoms.
Calcium hydroxide is an odorless white powder. It's utilized in industrial settings, inclusive of sewage treatment, paper production, creation, and food processing. It also has medical and dental makes use of. as an instance, root canal fillings frequently include calcium hydroxide.
Prolonged contact of the pores and skin with calcium hydroxide may motive skin and a vesicular rash, skin ulceration, and corrosion in a few cases. Ingestion of this material has induced intense pain, vomiting, tissue corrosion, perforation, and loss of life.
Calcium hydroxide, also called slaked lime, is obtained by using the motion of water on calcium oxide. While combined with water, a small share of it dissolves, forming an answer referred to as limewater, the relaxation ultimate as a suspension referred to as milk of lime.
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What does 2Na2O mean?
answer yes if the substance becomes part of the filtrate or answer no if the molecule does not become part of the filtrate
Yes, the substance becomes the part of filtrate. No, the molecule does not become part of the filtrate.
What is filtrate?The most common example is making tea. While preparing tea, a filter or a sieve is used to separate tea leaves from the water. Through the sieve pores, only water will pass. The liquid which has obtained after filtration is called the filtrate; in this case, water is the filtrate.
Which substance becomes the part of the filtrate?The substances that are normally found in the filtrate are plasma components (such as water, nutrients, dissolved gases, electrolytes, and metabolic wastes) excluding plasma proteins and blood cells.
Why molecule becomes the part of the filtrate?Proteins are large molecules that cannot pass the wall of capillaries during filtration, hence, this molecule is not normally part of the filtrate.
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