Refer to the two balanced chemical equations below. (1) CH4 + 2 O2 → CO2 + 2 H2O + 890 kJ (2) C3H8 + 5 O2 → 3 CO2 + 4 H2O + 2,220 kJ According to the information given, reaction 2 involves a change in energy than reaction 1.

reaction 2 involves a greater change in energy

Explanation:

(1) CH4 + 2 O2 → CO2 + 2 H2O + 890 kJ

(2) C3H8 + 5 O2 → 3 CO2 + 4 H2O + 2,220 kJ

The two reactions are exothermic as they are both combustion reactions.They both involve a change in energy. The first, 890KJ was released and in the second reaction 2220KJ of energy was released.

From the heat released from both reaction, there is a greater change in energy in reaction 2 because 2220KJ is greater than 890KJ.