Question

How many moles are in 15.0 grams of calcium (Ca)?

A.) 0.374 moles
B.) 2.67 moles
C.) 601.5 moles
D.) 2.40 x 10 25 moles

Answer 1

1 mol ---- 40g
X --------- 15g
X = 15/40 = 0,375 moles

:)

Answer 2

The correct answer is option A.) 0.374 moles

Step-by-step explanation:

Hello!

Let's solve this!

Calcium (Ca) has a mass of 40g / mol

In this case we have 15 g of Ca.

We need to calculate the amount of moles so the operation to be performed is as follows:

mol Ca = 15g * (1mol / 40g) = 0.375 mol

We conclude, after the calculations, that the correct answer is option A.) 0.374 moles