An excess of sulfuric acid solution was added to 4 g of copper (II) oxide. What is the mass of the salt formed?

Reaction equation: CuO + H2SO4 = CuSO4 + H2O.
Progress in solving the problem:
1 Calculation of the amount of copper oxide substance.
2 Finding the amount of copper sulfate substance.
3 Calculation of the mass of the formed salt.
Decision:
1. The amount of copper oxide substance is found by dividing the mass of the oxide by its molar mass: 4/80 = 0.05 mol.
2. Consider the reaction equation. One mole of copper oxide accounts for one mole of copper sulfate. This means that the amount of copper sulfate substance is 0.05 mol.
3. The mass of copper sulfate is: 0.05 * 160 = 8g – the answer.