Where more of hydrogen are contained in 90 g of water or in 80 g of methane

Define dew point. i am writing this part to be able to ask the question

Consider this initial-rate data at a certain temperature for the reaction described by

Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)