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 Form 4 Energy Changes in Chemical and Physical Processes Questions and Answers

Sulphur burns in air to form sulphur (IV) oxide. A simple energy level diagram for the reaction is given below. Study the diagram and answer the questions that follow.
figenergy24420201200.JPG
(a)What do the following represent?
(i)Δ#H_1#
(ii) Δ#H_3#
(b) Write an expression, for Δ#H_3# in terms of Δ#H_1# and Δ#H_2#

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