Question

Calculate the number of hydrogen atom present in 0.15 mole of water

Answer 1

we know that one mole of water weighs 18 grams and one mole of water contains 6.023 × 10²³ molecules of water and each water molecule contains 2 atoms of hydrogen.

⇒ 1 mole of water contains 2 × 6.023 × 10²³ = 12.046 × 10²³ hydrogen atoms.

the question is find the number of atoms in 0.15 mole

⇒ the number of hydrogen atoms in 0.15 mole is 0.15 × 12.046 × 10²³

⇒ the number of hydrogen atoms in 0.15 mole is 1. 8069 × 10²³