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Working with enthalpy change

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Consider the following reaction.
CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) H = -891 kJ
Calculate the enthalpy change for each of the following cases.
(a) 3.00 g methane is burned in excess oxygen.
(b) 3.00 103 L methane gas at 738 torr and 21°C is burned in excess

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In a coffee-cup calorimeter, 1.10 g of NH4NO3 is mixed with 76.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.93°C. Assuming the solution has a heat capacity of 4.18 J/°C · g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.

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