Question

A sample of calcium oxide has mass of 2.80 g. The molar mass of CaO is 58.08 g/mold how many moles of CaO does this sample contain

Answer 1

A. 0.0499

Step-by-step explanation:

The answer is A.

Answer 2

Hi!

To convert grams to moles, you need to divide the amount (grams) of your substance by its molar mass, both of which are given to you.

28 g CaO / 58.08 g/mol CaO = 0.4820936639 moles of CaO
(And 28 contains two significant digits, so you will round this to 0.48 moles.)

Good luck!