The enthalpy of formation of water from hydrogen and oxygen is-286.0Kj/mol. The enthalpy of decomposition of water into hydrogen and oxygen is
2 points
(a) -286.0 kj/mol
(b) -143.0kj/mol
(c)286.0kj/mol
(d)143.0kj/mol
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Answers
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Since, formation reaction is the reaction involving formation of 1 mole of that species from its constituent elements while decomposition reaction is breaking down of 1 mole of any species into its constituent species.
i.e for water
Formation reaction => H
2
+
2
1
O
2
→H
2
O
Decomposition reaction => H
2
O→H
2
+
2
1
O
2
Hence, the formation reaction and decomposition reaction are reverse reactions of each other.
Hence, the enthalpy of decomposition reaction will be negative of enthalpy of formation reaction i.e,
ΔH
d(H
2
O)
=−ΔH
f(H
2
O)
=−(−286.0)=286.0
Option c is correct answer.
Explanation:
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