M(Cu)=3,2т
m(Cu O)-?

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The molar mass of Cu is 63.55 g/mol, so for 3.2 mol of Cu the mass would be:

3.2 mol * 63.55 g/mol = 203.36 g

Now, we need to find the molar mass of CuO to calculate the mass. The molar mass of Cu is 63.55 g/mol and oxygen is 16 g/mol, so the molar mass of CuO is:

63.55 g/mol + 16 g/mol = 79.55 g/mol

Now, we can calculate the mass of 3.2 mol of CuO:

3.2 mol * 79.55 g/mol = 254.56 g

So, the mass of 3.2 mol of CuO is 254.56 g.