Chemistry, asked by Anonymous, 1 year ago

Please answer my question on the basis of Avogadro's hypothesis.Give a detailed answer...

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Answered by FlameFires

Given vapor density is 17. By definition, vapour density is half of the molecular mass of the compound. So, the mass of the gas so formed must be 34 u. As per avogadros law, equal volume (1 in this case) of hydrogen gas and Sulphur reacts to form one volume of the unknown gas. So, the gas must have some ratio of hydrogen and Sulphur only. As only one volume of hydrogen is used, and one volume of gas is formed, there must be two hydrogen atoms( as one molecule of hydrogen has two atoms of hydrogen) in the final gas. So, the gas must be H2Sx, where x is the number of atoms of Sulphur. Molecular mass is 34, so 2(1)+x(32)=34. Hence we get x to be 1. So, the gas so formed is hydrogen sulphide, H2S.

Anonymous: why two hydrogen atoms will be formed in 1 volume of gas?

FlameFires: You could say that no of volumes has same ratio to no of moles. So if equal volumes are participating, we can say it's equal moles too.

Anonymous: k thanks

FlameFires: If one mole of hydrogen reacts and forms only one mole of gas, it means the gas contains both hydrogen atoms. Suppose it formed TWO volumes of gas, then the gas would contain only one hydrogen.

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