1. The combustion of ethene, C2H4, is an exothermic reaction. Use the information below to
determine the amount of energy given off when 2.3 moles of ethene is combusted.
C2H4 + 3 02 02 CO2 + H2O
AH= - 1390 kJ

-3197 kj

Explanation:

Chemical equation:

C₂H₄ + O₂   →   CO₂ + H₂O       ΔH = -1390 KJ

Balanced chemical equation:

C₂H₄ + 3O₂   →   2CO₂ + 2H₂O    ΔH = -1390 KJ

It can be seen in equation that one mole of C₂H₄ react with 3 mole of oxygen and produced 1390 kj energy.

When 2.3 moles C₂H₄ react the energy produced is,

1 mole =  -1390 KJ

2.3 mol × -1390 KJ/ 1mol = -3197 kj

The given reaction is combustion reaction of hydrocarbon. when hydrocarbons burn in the presence of oxygen carbon dioxide and water are produced.

In given reaction 1 mole of ethylene react with 3 moles of oxygen and produced 2 moles of CO₂  and 2 moles of water.

yes it is balanced

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