Multiple choice How much 22.4 litres of NH3 will weigh at S.T.P? 44.8 gm 22.4 gm 17 gm 11 gm 14 gm Reveal answer Fill a bubble to check yourself C Correct answer Explanation 22.4 litres of every gas at S.T.P weigh its gram molecular weight. Gram molecular weigh for NH3 $\to$17 gm