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Which method for calculating moles of oxygen gas is probably most accurate, Method 1, which is based on the mass of gas...

Which method for calculating moles of oxygen gas is probably most accurate, Method 1, which is based on the mass of gas captured in the balloon, Method 2, which is based on the mass that is missing from the solution after the reaction, or Method 3, which is based on the Ideal Gas Law, PV = nRT, and not on mass? Explain.

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Answer #1

Method 1, which is based on the mass of gas captured in the balloon,

mass of gas captured may contains other gases with certain percent. so that there are error arises in calculate the mole of O2 gas.

mole = mass / molar mass.

Method 2, which is based on the mass that is missing from the solution after the reaction.

after the reaction, some of O2 gas remain in reaction mixture as dissolved condition. so this is not more accurate.

Method 3, which is based on the Ideal Gas Law, PV = nRT, and not on mass.

ideal gas equation is

PV = nRT

n = PV / RT

when we know, pressure , volume and temperature then we can calculate the mole of O2 gas.

Method 3, which is based on the Ideal Gas Law, PV = nRT, and not on mass. (answer)

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