1) Which combustion reaction releases the least energy per mole of C,Hu? Approximate bond enthalpy / kJmol O=0 500 C=0 800 C=0 1000 A. C,H, (g) +50,(9) 300,(g) + 4H2O(g) 9 B. C,H. (9) + 20 (9) 2007 (9) + CO(g) + 4H,0(g) C. C,H, (g) + 40, (g) CO2(g) + 2CO(g) + 4H2O(g) + D. CyHo(9) +20,(9) + 3CO(g) + 4H,0 (9) 12 Which statement describes an endothermic reaction? A. The bonds broken are stronger than the bonds formed. B. The enthalpy of the reactants is higher than the enthalpy of the products. C. The temperature of the surroundings increases. D The products are more stable than the reactants