Question

What is the mass of `9.34 * 10^24` molecules of water?

Answer 1

279.4 grams

Explanation:

1 mol of water (18.015 g) is `6.022xx10^23` molecules of water.

If we divide `9.34xx10^24` by `6.022xx10^23` gives 15.51 mols

Therefore that amount of water molecules is:

`15.51 mol xx 18.015g/(mol) =279.4 grams`