Work out the enthalpy

Exercise and reference answers

Questions

1. Hint

   reactants minus products

   Unit

   kJ

   Answer

   -132

   Question

   Reactant bonds total 2712 kJ, product bonds 2844 kJ. ΔH?

2. Hint

   4 x 416

   Unit

   kJ

   Answer

   1664

   Question

   C2H4 has 4 C-H bonds at 416 kJ. Their total?

3. Hint

   6 x 416

   Unit

   kJ

   Answer

   2496

   Question

   CH3CH3 has 6 C-H bonds at 416 kJ. Their total?

Instructions

Use bonds in reactants minus bonds in products, and key in the answer.