Find the mass of copper (II) oxide if 45 g of copper (II) nitrate containing 5% impurities has entered

Find the mass of copper (II) oxide if 45 g of copper (II) nitrate containing 5% impurities has entered the decomposition reaction.

Let’s implement the solution:

Using the data on the condition of the problem, we will compose the equation of the process:
2Cu (NO3) 2 = 2CuO + 4NO2 + O2 – OBP, copper oxide was obtained;

Calculations according to the formulas of substances:
M Cu (NO3) 2 = 97.5 g / mol;

M (CuO) = 79.5 g / mol;

m Cu (NO3) 2 = 45 * (1 – 0.5) = 22.5 g (weight without impurities);

Y Cu (NO3) 2 = m / M = 22.5 / 97.5 = 0.2 mol.

Find the mass of the product:
m (CuO) = Y * M = 0.2 * 79.5 = 15.9 g

Answer: the mass of copper (2) oxide was 15.9 g