Question

11.2 cm³ of hydrogen gas at STP, contains …………….. moles.

(A) 0.0005 

(B) 0.01 

(C) 0.029 

(D) 0.5

Answer 1

(A) 0.0005

As we know,

\(1\,cm^3=1\,ml\)

\(\therefore 11.2\,cm^3=11.2\,ml\)

The volume of 1 mole of any gas at STP contain = 22400 ml/mol

\(\therefore\) Number moles of hydrogen gas = \(\frac{11.2\,ml}{22400\,ml/mol}\)

= \(5\times10^{-4}\) moles or 0.0005 moles.

Answer 2

Option : (A) 0.0005