Exothermic Reaction is a reaction during which heat is given out the change in heat is represented by a negative sign.
Combustion of coal in air produces C02 with the release of 393.7-kiloJoules of heat. When 1 mole of coal is burnt in 1 mole of Oz to produce 1 mole of CO2.
C + O2 -> COz H = -393.7 KJ/mol.
Endothermic Reaction is the chemical change during which heat is absorbed or taken in from the surroundings. The container becomes cold.
(i) Decomposition of Water (HzO) into Hydrogen Hz and Oxygen Oz on passing through water.
HzO -> Hz+ 1/2 O2
ΔH = + 286 K Joule/mole
(ii) Formation of Nitric Oxide (NO) by the combination of 1/2 mole N2 with 1/2 mole of O2
1/2 N2+1/2 O2 -> NO
ΔH = + 90.25 K.J/mol
Your email address will not be published. Required fields are marked *
Save my name, email, and website in this browser for the next time I comment.