# Which sample has the greatest mass? (multiple choice)

##
A. 1 mol of Na2S

B. 3.0 x #10^24# molecule of O2

C. 8.8 x 10 g of NaCl

D. 1.2 x #10^24# atoms of K

The answer is B. 3.0 x #10^24# molecule of O2, why?

A. 1 mol of Na2S

B. 3.0 x

C. 8.8 x 10 g of NaCl

D. 1.2 x

The answer is B. 3.0 x

##### 1 Answer

The answer is B.

#### Explanation:

**A**

To calculate the mass of 1 mol of

**B**

To calculate the mass of

This gives us the moles of

Then we multiply by the molar mass.

**C**

For C we only have 88 g.

**D**

And for D the molar mass of

This means