Question

A compound has molar ratio of atoms X and y in it is 2:3 if its molecular mass is 140U and atomic mass of X is 20 and that of Y is 10. The molecular formula of the compound will be

Answer 1

Answer:

Explanation:

molar ratio is 2:3. Thus empirical formula is x₂y₃.

Thus empirical mass is 20(2) +10(3) = 70.

molecular mass = 140.

molecular formula = n * empirical formula  

where n= (empirical mass)/(molecular mass)

so here, n= 140/70 = 2.

thus molecular formula is 2 * x₂y₃ = x₄y₆.

hope it helps you.