Question

calculate the number of moles of water molecules in 90 kg of water

Answer 1

Answer:

5 moles

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.

Answer 2

Answer:

5000 moles

Explanation:

1 mole water = 18g of h20

1/18 mole of h20 = 1 g of H20

1/18 x 1000 mole of water = 1000g of h20 = 1kg of h20

1000/18 x 90 mole of water = 90kg of water

5000 moles of H2O = 90kg Of H2O