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A mixture of hydrogen.and oxygen contains 20% by mass of hydrogen.What is the total no of molecules present ler gram of the mixture? |
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Answer» 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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