Question

The mass of 11.2 L of ammonia gas at S.T.P. is

• A. 8.5 g
• B. 85 g
• C. 17 g
• D. 1.7 g

Answer 1

Answer: (A)

8.5 g

Answer 2

Molar mass of $NH_{3}=14+3\times1=17\,g\,mol^{-1}$ $\therefore$ Mass of $22.4\, L$ of $NH_{3}$ at S.T.P. $= 17 \,g$ $\therefore$ Mass of $11.2\,L$ of $NH_{3}$ at $S.T.P.=8.5\,g$