Question

What is the mass of 2.5 moles of water?

Answer 1

Explanation:

The amount of oxygen in 2.5 moles of water is 40 grams.

The molecular formula of water is H₂O. 1 mole of water contains 1 mole of oxygen.

Answer 2

Mass of 2.5 moles of water is 1.5×10²⁴ molecules

Molar mass of a compound is the mass of a sample of the compound divided by the amount of substance in the sample

Explanation:

The number of molecules from moles by using Avogadro's constant,  

6.023×10²³ molecules/mol.

For each moles there is 6.023×10²³ molecules

For every 2.5 moles of water =2.5× 6.023×10²³

=1.5×10²⁴ molecules is the mass of 2.5 moles of water.