How many atoms of hydrogen is present in 0.5 gm mole of water?

Answer 1

I assume you mean 0.5 grams water.

0.5 grams water (1 mole H2O/18.016 grams)(2 moles H/1 mole H2O)(6.022 X 10^23/1 mole H)

= 3.3 X 10^22 atoms of hydrogen

Answer 2

In 0.5 g of water (H2O), there are approximately 3.34 x 10^22 atoms of hydrogen present. This is calculated using Avogadro's number and the molecular weight of water.