Determine the value of K for the reaction chemistry homework help

Determine the value of K for the reaction chemistry homework help

A 115.5 g sample of ammonia gas is placed in a 250ml flask. It dissociates as follows:

2 NH3 (g) <–> 3H2 (g) + N2 (g)

At equilibrium 17.5 g of hydrogen gas are present. Determine the value of K for the reaction.