A compound has a molar mass of 319.9g/mol and contains 30.01 % oxygen atoms by mass.How many oxygen atoms are in each molecule of this compound?
A)6
B)4
C)10
D)3
E)7

Question

Quizplus · Accepted Answer

The mass of oxygen in the compound is 30.01% of 319.9 g/mol, which is approximately 96.0 g/mol. The molar mass of one oxygen atom is about 16.0 g/mol, so the number of oxygen atoms is 96.0 g/mol divided by 16.0 g/mol, which equals 6.

A Compound Has a Molar Mass of 319