Chemistry

Problem

A sample contains 9.81 g Zn (atomic mass 65),

1.8 \times 10^{23}

atoms of Cr and 0.6 g-atoms of Cr. The simple formula of this compound is : a.

{\text{ZnCrO}}_4

{\text{ZnCr}}_2{\text{O}}_4

{\text{Zn}}_2{\text{CrO}}_4

{\text{ZnCrO}}_3