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A mixture of hydrogen and oxygen contains 20%of mass of hydrogen. What is the total number of molecules present per gram of the mixture

A mixture of hydrogen and oxygen contains 20%of mass of hydrogen. What is the total number of molecules present per gram of the mixture

Grade:11

1 Answers

ARoberts
35 Points
6 years ago
P.S: I got this question for homework today and am not sure if this is the right solution. Here goes:Assume you have a 100g mixture of O2 and H2.20% i.e. 20g will be H2 and the rest i.e. 80g will be O2.Thus 1g of mixture will have 0.2 and 0.8 hydrogen and oxygen, respectively.Molar mass of h2 molecule is 2 (atomic mass 1*2 atoms= 2) and that of O2 is 32Thus by gram molecular mass theory, 2g H2 will have 1 mole h2 molecules and therefore 0.2g should have 0.1mole = 6.02*10^22Similarly on solving for o2, we get 1.505*10^21 molecules.Add the 2 values to get total number of molecules in 1g of that mixture.

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