Calculate the amount of copper substances with a mass of 12.8.

From the task it follows that it is necessary to calculate the amount of copper, knowing that its mass is 12.8 g.
The amount of a substance is calculated by the formula where the mass is divided by the molar mass, that is, the formula looks like this:
n = m / M
Where m is mass, M is molar mass.
The molar mass of copper is 64 g / mol.
This means that in order to find out the amount of copper substance, you need to divide 12.8 g by 64, the result is the following solution:
n = 12.8 ÷ 64 = 0.2 mol.
Answer: the amount of copper substance with a mass of 12.8 g is 0.2 mol.

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