Question

Formula unit mass for $\mathrm{ZnO}$ is

Answer 1

Analyze atomic masses of elements present in Zinc oxide $\left(\mathrm{ZnO}\right)$:

• The atomic mass of $\mathrm{Zn}=65\mathrm{u}$
• The atomic mass of $\mathrm{O}=16\mathrm{u}$

Analyze the formula unit mass for Zinc oxide:

Formula unit mass for$\mathrm{ZnO}=(\mathrm{atomic}\mathrm{mass}\mathrm{of}\mathrm{Zn})+(\mathrm{atomic}\mathrm{mass}\mathrm{of}\mathrm{O})$

$=65\mathrm{u}+16\mathrm{u}=81\mathrm{u}$

Hence, the formula unit mass for$\mathrm{ZnO}=81\mathrm{u}$