Question

How many atoms of hydrogen are there in 25 g of Nh4cl

Answer 1

Molar mass of NH4Cl is 53.5
Thus, in 25g there are 25/53.5 = 0.467 moles

In one mole of NH4Cl there are 4 moles of hydrogen atoms
thus in 0.467 moles there are 4*0.467*6.022*10^23 atoms of hydrogen = 11.24*10^23 atoms of hydrogen