Using the following equation for the combustion of octane, calculate the heat associated combustion of 100.0 g of octane assuming complete combustion. The molar mass of octane is 114.33 g/mole. The molar mass of oxygen is 31.9988 g/mole
2 C8H18 + 25 O2 → 16 CO2 + 18 H2O
ΔH∘rxn = -11018 kJ

a) 535.4 kJ
b) -385.5 kJ
c) -602.3 kJ
d) -11018 kJ
e) -4819 kJ

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next