Enthalpy & Thermochemistry

q = mc\Delta T = 2100\ J

Heat energy (q)2100 J

Reaction typeexothermic

ΔH (molar enthalpy)-21.0 kJ/mol

Mass of water (g)100

Temperature change (°C)5

Moles of reactant0.1

Make the water temperature rise — confirm the reaction is exothermic
Make the water temperature fall — confirm the reaction is endothermic
With 100 g of water and a 5°C rise, confirm the heat released reads exactly 2100 J
Confirm an exothermic reaction always gives a NEGATIVE molar enthalpy change
Confirm an endothermic reaction always gives a POSITIVE molar enthalpy change