Question

90g of H2O is equal to how many moles of H2O ? ​

Answer 1

5 moles

Step-by-step explanation:

For water we have 2 hydrogen atoms and one oxygen, so the atomic weight of water is 1+1+16=18, so a mole of water is 18 grams. We have 90g of water so we have 90/18 = 5 moles of water.