# How much of a substance is contained in 140 calcium oxide?

September 28, 2021 | education

| Given:

m (CaO) = 140 g.

Find:

n (CaO) -?

Solution:

If we know the mass of a substance, then its amount can be found by the formula n = m / M (Where n is the amount of the substance, m is the mass of the substance, M is the molar mass of the substance).

Molar mass (M) of calcium oxide (CaO) = 140 g / mol.

Now we substitute the known to the formula for finding the amount of substance.

n (CaO) = 140 g / 140 g / mol.

n (CaO) = 1 mol.

Answer: n (CaO) = 1 mol.

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