To calculate the number of moles, you can use the formula:
\[ \text{moles} = \frac{\text{mass (grams)}}{\text{molar mass}} \]
The molar mass of zinc oxide (ZnO) is the sum of the atomic masses of zinc (Zn) and oxygen (O).
- Atomic mass of Zn ≈ 65.38 g/mol
- Atomic mass of O ≈ 16.00 g/mol
\[ \text{Molar mass of ZnO} = \text{Atomic mass of Zn} + (\text{Atomic mass of O} \times 2) \]
\[ \text{Molar mass of ZnO} = 65.38 + (16.00 \times 2) \]
Now, calculate the moles:
\[ \text{moles} = \frac{67}{\text{Molar mass of ZnO}} \]
Plug in the values and calculate.