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

Answer 2

The formula mass of a substance is defined as the sum of the average atomic masses of each atom present in the chemical formula.

How to calculate formula mass?

In order to calculate formula mass, we multiply the subscript of each element in the formula by the atomic weight of that element that is found on the periodic table so we can conclude that the copper atomic mass is multiply by the subscript present in front of copper atom.

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