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The reaction which shows standard heat o...

The reaction which shows standard heat of formation of water correctly is 

A

`H _(2 (g)) + 1/2 O _(2(g)) to H _(2) O _((,)) , Delta H =- 68. 3 kcal`

B

`H _(2 (g)) +1/2 O _(2 (g)) to H _(2) O _((s)) , Delta H =- 68.3 kcal `

C

`H _(2 (g)) + 1/2 O _(2(g)) to H _(2) O_((g)), Delta H =- 68.3 kcal `

D

`2H _(2 (g)) + 1/2 O _(2 (g)) to 2 H _(2) O _((l)) , Delta H =- 136 .6 kcal`

Text Solution

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The correct Answer is:
A
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