Calculate the mass of copper (II) oxide obtained by the interaction of copper with oxygen with an amount of 0.25 mol.

The combustion reaction of copper in oxygen is described by the following chemical reaction equation:

2Cu + O2 = 2CuO;

Using 0.25 mol of oxygen, 0.5 mol of copper (II) oxide can be obtained.

Determine the molar mass of copper (II) oxide:

M CuO = 64 +16 = 80 grams / mol;

Find the mass of 0.5 mol of copper (II) oxide:

m = 0.5 x 80 = 40 grams;