1. Air is composed of several gases. The partial pressure of Nitrogen is 593.4 mm Hg. The partial pressure of Argon is 7.07 mm Hg. The other gases, besides oxygen, total 0.31 mm Hg. What is the partial pressure of oxygen at mean sea level?

option c: 1605.1 kj

the balanced chemical reaction for combustion of methane is as follows:

here, enthalpy formation of is -74.7 kj/mol, 0 kj/mol, -393.5 kj/mol and -241.82 kj/mol respectively.

the heat released or can be calculated as follow:

putting the values,

thus, heat released by combustion of 1 mol of methane is 802.54 kj/mol. thus, for 2 mol, heat released will be:

therefore, heat released by the combustion of 2 mol of methane is 1605.1 kj.