Question

•We know that 11.2% of the weight of water is due to Hydrogen

•So, in 100 g of water, 11.2 g of it is due to H

•11.2 g H: 100 g H2O

•2 Mol of H : 1 Mol of H2O

•If we have 1.5 kg of H2O, what is the weight of H in grams?

•If we have 2.7 mols of H2O, what is the weight of H in grams?

Answer 1

We know that 11.2% of the weight of water is due to Hydrogen

So, in 100 g of water, 11.2 g of hydrogen (H) is present.

Now Case 1:

1.5 kg of H₂O = 1500 g of water (H₂O)

So, in 1.5 kg of H₂O, { (11.2 x 1500 )/ 100 } = 168 g of hydrogen (H) is present. (ANSWER 1)

Now Case 2:

1 mole of H₂O = 18 g of water (H₂O)

If we have 2.7 mole of H₂O =( 18 x 2.7 ) g = 48.6 of water (H₂O)

So, in 2.7 mole of H₂O, { (11.2 x 48.6 )/ 100 } = 5.443 g of hydrogen (H) is present. (ANSWER 2)