Question

Calculate the enthalpy change for the combustion of methane gas (CH4) at standard conditions given the following information: 4 moles of methane gas is burned in excess oxygen gas (O2) to form carbon dioxide gas (CO2) and liquid water (H2O). The enthalpy change for the combustion of 1 mole of methane gas is -890.4 kJ/mol.

Answer 1

To calculate the enthalpy change for the combustion of 4 moles of methane gas, we can use the given enthalpy change for the combustion of 1 mole of methane gas and multiply it by the number of moles.Enthalpy change for 1 mole of methane gas = -890.4 kJ/molNumber of moles of methane gas = 4 molesEnthalpy change for 4 moles of methane gas =  -890.4 kJ/mol   4 moles = -3561.6 kJTherefore, the enthalpy change for the combustion of 4 moles of methane gas at standard conditions is -3561.6 kJ.