Calculate the mass of CuO obtained by reacting Cu with O if the amount of substance is 0.25 mol.

univerkov | April 27, 2021 | education

Given:
n (O2) = 0.25 mol

To find:
m (CuO) -?

1) 2Cu + O2 => 2CuO;
2) n (CuO) = n (O2) * 2 = 0.25 * 2 = 0.5 mol;
3) M (CuO) = Mr (CuO) = Ar (Cu) * N (Cu) + Ar (O) * N (O) = 64 * 1 + 16 * 1 = 80 g / mol;
4) m (CuO) = n (CuO) * M (CuO) = 0.5 * 80 = 40 g.

Answer: The mass of CuO is 40 g.

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