Is anyone taking Integrated Physics and Chemistry (2014) on switched on schoolhouse if so please answer I have a question ab the class!! Thanks

Based on the equation and the information in the table, what is the enthalpy of the reaction?

What is the molar mass of a gas that has density of 2.054 g/l

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)