Question

if a compounds have of calcium oxide is a mass of 5.45 grams, what would be the number of moles for this mass? (round to the 4th decimal place)

Answer 1

0.0972

Step-by-step explanation

Given:

Mass of calcium oxide = 5.45 grams

What to find:

The number of moles for the mass.

Step-by-step solution:

The number of moles in 5.45 grams CaO can be calculated using the mole formula.

`Mole=\frac{Mass}{Molar\text{ }mass}`

From the periodic table, the molar mass of CaO = (40.078 + 15.999) = 56.077 g/mol

Therefore,

`Mole=\frac{5.45\text{ }g}{56.077\text{ }g\text{/}mol}=0.0719\text{ }mol`

The number of moles for the mass of 5.45 grams CaO = moles