Question

What is the enthalpy change for the combustion reaction of methane gas (CH4) when 2.50 moles of methane are burned in excess oxygen gas under standard conditions?

Answer 1

The balanced chemical equation for the combustion of methane is:CH g  + 2O g   CO g  + 2HO l The standard enthalpy change of combustion for methane  H  is -890.4 kJ/mol.To find the enthalpy change for 2.50 moles of methane, we can use the following equation:H = n  Hwhere n is the number of moles of methane and H is the standard enthalpy change of combustion for methane.H =  2.50 mol    -890.4 kJ/mol  = -2226 kJSo, the enthalpy change for the combustion of 2.50 moles of methane is -2226 kJ.