From the enthalpy values, 1244.8 kJ of heat is given off when 162.5 g of oxygen reacts with excess ammonia.
What is the amount of heat given off in a reaction?
The amount of heat given off in a reaction is known as enthalpy change.
Heat is given off in an exothermic reaction.
From the enthalpy value of the given reaction, 1225
6 kJ of heat is given off when 5×32 g or 160 g of oxygen reacts with ammonia.
Amount of heat given off when 162.5 g of oxygen reacts with excess ammonia is;
Heat given off = 1225.6 kJ × 162.5/160 = 1244.8 kJ
Therefore, 1244.8 kJ of heat is given off when 162.5 g of oxygen reacts with excess ammonia.
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