Question

The number of Cr and O atoms in a compound are 4.8 × 1010 and 9.6 × 1010 respectively. The molecular formula of the compound is: (1) Cr2O3 (2) CrO2 (3) Cr2O4 (4) none of these

Answer 1

Answer:

The number of atoms of Cr and O in a compound is 4.8×10 ^10

and 9.6×10 ^10 respectively.

The ratio of the number of atoms of Cr to O is

9.6×10 ^10 /4.8×10 ^10 = 2:1

Its empirical formula is CrO 2