Consider the following generic chemical equation:
A
+ B
-
C
+ D
Reactant A contains 85.1 J of chemical energy
Reactant B contains 87.9 J of chemical energy
Product C contains 38.7 J of chemical energy. If
the reaction absorbs 104.3 J of chemical energy
as it proceeds, how much chemical energy must
product D contain? Explain your answer.

There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. in the first step, calcium carbide and water react to form acetylene and calcium hydroxide: cac2 (s) + 2h2o (g) → c2h2 (g) + caoh2 (s) =δh−414.kj in the second step, acetylene, carbon dioxide and water react to form acrylic acid: 6c2h2 (g) + 3co2 (g) + 4h2o (g) → 5ch2chco2h (g) =δh132.kj calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxide from these reactions. round your answer to the nearest kj .