Question

calculate the number of moles of hydrogen atoms in 45g of water​

Answer 1

Answer:

Moles of water = 45/18

no of H atoms in a water molecule =2.

moles of H atoms in 1 mol water molecule=2 mole. 

moles of H atoms in 45/18 mole of water= 2×(45/18) moles.

Hence number of H atoms in 45g of water = 2×(45/18)×N

Answer 2

Answer:

moles of H atoms in 1 mole of water molecule is equals to 2 mole.

moles of H atoms in 45/18.

mole of water=2x(45/18) moles hence number of H atoms in 45g of water=2x(45/18)xN

(where N is avagadro's constant)