Question

Calculate number of moles of hydrogen in 0.448 litre of hydrogen gas at STP.

Answer 1

Given : Volume of hydrogen at STP = 0.448 L 

To find : Number of moles of hydrogen

Formula :

Number of moles of a gas(n) = \(\frac{Volume\,of\,gas\,at\,STP}{Molar\,volume\,of\,a\,gas}\)

Molar volume of a gas = 22.4 dm³ mol^-1 = 22.4 L at STP

Number of moles of a gas(n) = \(\frac{Volume\,of\,gas\,at\,STP}{Molar\,volume\,of\,a\,gas}\)

= \(\frac{0.448\,L}{22.4\,L\,mol^{-1}}\)

= 0.02 mol.

∴ Number of moles of hydrogen = 0.02 mol