Question

A 1.0mol sample of which of the following compounds has the greatest mass?

A- NO
B- NO2
C- N2O
D- N2O5

Answer 1

Given - Number of moles - 1 mole

Compounds - NO, NO2, N2O and N2O5.

Find - Greatest molecular weight.

Solution - Number of moles and mass is related by the formula - Mass/Mass of one mole.

Hence, keeping the values in formula -

For NO,

Mass - 1*30

Mass - 30 gram.

For NO2,

Mass - 1*46

Mass - 46 gram.

For N2O,

Mass - 1*44

Mass - 44 gram.

For N2O5,

Mass - 1*108

Mass - 108 gram.

Therefore, 1 mole sample of N2O5 has the greatest mass.