Question

the mass percentage of carbon is 27.28% and the mass percentage of oxygen is 72.73%. calculate the molecular mass of that compound​

Answer 1

The molecular mass of that compound will be - 44g

Mass percentage of carbon - 27.28%

Weight of carbon is - 12g

Number of moles of carbon - 2.27

Mass percentage of oxygen - 72.73%

Weight of oxygen - 16g

Number of moles of oxygen - 4.5

Finding empirical formula of given compound from their number of moles.

C - 2.27, O - 4.5

C-1, O-2

Hence, empirical formula will be CO2.

Finding molecular weight on the basis of empirical formula -

12+16*2

12+32

44g

Hence, molecular weight of given will be 44g.