The mass of a litre of oxygen at standard conditions of temperature and presssure is 1.43 g and the of a litre of SO_(2) is 2.857 g. (i) How many molecules of each gas are there in this volume? (ii) What is the mass in grams of a single molecules of each gas ? (iii) What are the molecular masses of SO_(2) and O_(2) respectively?

The mass of a litre of oxygen at standard conditions of temperature an

1.	The mass of a litre of oxygen at standard conditions of temperature and presssure is 1.43 g and the of a litre of SO_(2) is 2.857 g. (i) How many molecules of each gas are there in this volume? (ii) What is the mass in grams of a single molecules of each gas ? (iii) What are the molecular masses of SO_(2) and O_(2) respectively?
Answer» SOLUTION :`1LO_(2)orSO_(2)=(1)/(22.4)mol=(1)/(22.4)xx6.02xx10^(23)" molecules"=2.688xx10^(22)" molecules"` `"Mass of 1 molecule of "O_(2)=(1.43)/(2.688xx10^(2))=1.0629xx10^(-23)g` Gram MOLECULAR mass of `O_(2)="Mass of 22.4 L at STP"=1.43xx22.4=32.032g` `"Molecular mass of "O_(2)=32.032u` Similarly, molecular mass of `SO_(2)` can be calculated.