Question

Which statement about the following reaction is correct?

CH4 (g) + 2O2 (g) yields CO2 (g) + 2H2O(l) deltaH = -890 kJ

Answer 1

reacting one mole of oxygen (O2) absorbs 445 kJ of energy

reacting one mole of oxygen (O2) releases 445 kJ of energy

reacting one mole of methane (CH4) absorbs 890 kJ of energy

reacting two moles of methane (CH4) releases 890 kJ of energy

Answer 2

As delta H < 0, this is an exothermic reaction and thus releases energy. Option B or D left.
Simple mole ratios will tell us answer is B) reacting one mole of oxygen (O2) releases 445 kJ of energy