Question

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

Answer 1

◽️◽️◽️ MOLE CONCEPT ◽️◽️◽️

1 mole of NH4Cl = 53.5 g

1 mole of NH4Cl = 4 moles of H

53.5 g of NH4Cl = 4 g of H

25 g of NH4Cl = 4/53.5*25 = 1.86 g of H

Answer 2

Answer : The number of hydrogen atoms in 25 g of $NH_4Cl$ is, $11.249\times 10^{23}$

Solution : Given,

Mass of $NH_4Cl$ = 25 g

Molar mass of $NH_4Cl$ = 53.491 g/mole

First we have to calculate the moles of $NH_4Cl$.

$\text{Moles of }NH_4Cl=\frac{\text{Mass of }NH_4Cl}{\text{Molar mass of }NH_4Cl}=\frac{25g}{53.491g/mole}=0.467moles$

Now we have to calculate the number of hydrogen atoms.

In the given molecule, there are 4 number of hydrogen atoms.

As, 1 mole of hydrogen contains $4\times 6.022\times 10^{23}$ number of hydrogen atoms

So, 0.467 mole of hydrogen contains $0.467\times 4\times 6.022\times 10^{23}=11.249\times 10^{23}$ number of hydrogen atoms

Therefore, the number of hydrogen atoms in 25 g of $NH_4Cl$ is, $11.249\times 10^{23}$