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The value of ΔHO—H is 109 kcal mol−1 . Then formation of one mole of water in gaseous state from H (g) and O (g) is accompained by : (a) absorption of 218 kcal of energy (b) release of 218 kcal of energy (c) release of 109 kcal of energy (d) unpredictable |
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Answer» Correct option (b) release of 218 kcal of energy Explanation: In water 2(O—H) bonds are formed. So the value of ΔH for the formation of one mole of water in gaseous state is ΔH = −2 × 109 = −218 kcal |
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