Question

A compound contains `10^(-2)%` of phosphorus. If atomic mass of phosphorus is `31`, the molar mass of the compound having one phosphorus atom per molecule is:
A. `31`
B. `31 xx 10^(2)`
C. `31 xx 10^(4)`
D. `31 xx 10^(3)`

Answer 1

Correct Answer - C
`10^(-2) P` then mol.wt.of compound `= 100`
`31 g P` then mol.wt.of compound
`=(100xx31)/(10^(-2))=31xx10^(4)`