How many moles of bromine are required to react with 2.8 moles of aluminum? 2.8 moles Al X 1 mole Al X 2 mole Br2 X 79.9 g Br2 = 336 g Br2
27 g Al 3 mole Al 1 mole Br2

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.