Question

48 dm3 of ammonia at stp weighs 3.4 g. Calculate the molecular weight of the gas.

Answer 1

Volume = 4.48 dm3 = 4.48 L

gram molecular mass = 22.4 L at STP

so, 4.48 L of ammonia gas weighs= 3.49 g

22.4 L of ammonia weighs = 22.4 x 3.49 /4.48

= 17.45 g