What is the relative molecular mass of a compound which has empirical formula CH2O? [C= 12, H= 1, O= 16]

A. 42
B. 45
C. 126
D. 180

Correct Answer: Option D

Explanation

Molecular formula = (empirical formula x n)

where n= (1,2,3,…)

CH2O=12+(2×1)+16=30

Relative molecular mass = (30 x n)

From the options, only 180 is a multiple of 30, when n=6.