# How many moles are in a 42.5 g sample of magnesium oxide #MgO#?

##### 1 Answer

Apr 9, 2017

#### Answer:

Approx.

#### Explanation:

Oxygen has an atomic mass of

How many

To find the molar quantity, we simply divide the mass by the molar quantity, to get an answer in

The answer is dimensionally consistent; we wanted an answer in moles. We got an answer in

How many formula units of