When 2.50 g of methane burns in oxygen, 125 kj of heat is produced. what is the enthalpy of combustion per mole of methane under these conditions?

The enthalpy of combustion per mole of methane is 801.28 kJ.

Explanation:

To calculate the number of moles, we use the equation:

Given mass of methane = 2.50 g

Molar mass of methane = 16 g/mol

Putting values in above equation, we get:

We are given:

Enthalpy of combustion for given mass = 125 kJ

Using unitary method, we get:

If 0.156 moles of methane has an enthalpy of combustion as 125 kJ.

So, 1 mole of methane has an enthalpy of combustion =

Hence, the enthalpy of combustion per mole of methane is 801.28 kJ.

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