Question

If a copper-containing compound is found to be 29.2% Cu by mass, and there is only one copper atom per formula unit, what is the formula mass of the compound in amu?

Answer 1

Answer : The formula mass of the compound in amu is, 217.62 amu

Explanation : Given,

29.2 % Copper by mass that means 29.2 grams of copper present in 100 grams of compound.

As we know that,

1 atom of copper has an atomic mass of 63.546 amu.

Now we have to determine the formula mass of the compound.

$\text{Formula mass of compound}=\frac{\text{Atomic mass of copper}}{\text{Given mass of copper}}\times \text{Mass of compound}$

$\text{Formula mass of compound}=\frac{63.546amu}{29.2g}\times 100g=217.62amu$

Therefore, the formula mass of the compound in amu is, 217.62 amu