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(a) Define the standard enthalpy of formation of a substance.
(b) Use the thermo chemical equations below to answer the questions that follow.
(i) Name two types of heat changes represented by #Delta#H3
(ii) Draw an energy level diagram for the reaction represented by equation 1.
(iii) Calculate the standard enthalpy of formation of ethane.
(iv) When a sample of ethane was burnt, the heat produced raised the temperature of 500g of water by 21.5 K.(specific heat capacity of water=#4.2Jg^-1#K).
Calculate the:
I. Heat change for the reaction.
II. Mass of ethane that was burnt. (relative formula mass of ethane=30)