Question

The mass of 224 mL of hydrogen gas at STP is :

(A) 0.02 g 

(B) 0.224 g 

(C) 2.24 g 

(D) 20.0 g

Answer 1

(A) 0.02 g

As we know,

The volume of 1 mole of any gas at STP contain = \(22400\,ml/mol\)

\(\therefore \) Number of moles of hydrogen gas = \(\frac{224\,ml}{22400\,ml/mol}\)

weight (mass) of \(10^{-2}\) mol of hydrogen gas = \(10^{-2}\times2\)

= 0.02 g

Answer 2

Option : (A) 0.02 g