4.12 calculate molar enthalpy change from heat energy change

ΔH =	T (C) x mass of H2O (g) x 4.2J/g C./
	number of moles

ΔH is measured in J/mol or kJ/mol.

• ΔH = molar enthalpy change
• T = temperature increase or decrease caused by the reaction
• mass of H₂O = mass of water in grams;
• 4.2J/g C = specific heat capacity of water
  
  
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