Question

Number of atoms in 1.12 L of methane gas at STP. ( hydrogen)

Answer 1

at stp volume of methane is 22.4L

given volume at stp is 1.12L

so no of mole is equal to 1.12/22.4 equal to 0.05

here we have 0.05 mile of methane is present.

One mole of methane contain

$6.023 \times {10}^{?23}$

molecules

so 0.05 mole of methane will contain

$6.023 \times {10}^{?23} \times 0.05 = 3.0115 \times {10}^{22?}$

molecules

one molecule of methane contain 5 atoms

so

$3.0115 \times {10}^{?22}$

molecules will contain

$3.0115 \times {10}^{22?} \times 5 = 1.505 \times {10}^{23?}$

this is the ans.

hope it helps ☺