Question

The number of H atom present in 90g ice

Answer 1

Answer:

There is one Oxygen atom in each water molecule, so the number of oxygen atoms is the same as the number of water molecules.

A mole of a compound is a number of grams equal to the atomic weight of a molecule of the compound, so 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

1 atom of water ( ice ) consists of 1  atom Oxygen and  2 atoms of Hydrogen.

we know that :-

Atomic weight of water = 1× 2 + 16 = 18 gm

18 gm of water has 2 atoms of hydrogen

∴ 1 gm of water has  = 2/ 18 atoms of hydrogen

∴ 90 gm of water has =( 2/18 × 90) atoms of hydrogen.

                                     =  10

Ans :-  10 Hydrogen atoms are present in 90 gm of water ( ice ).