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standard enthalpies of formation help Watch

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    Hello, could someone tell me whether my answer is right? if not, where did i go wrong please? i have an exam tomorrow and hardly understand thisName:  image.jpg
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    My neck hurts.

    You should be subtracting the - 1155 from the - 1154, i.e. it just looks like you've put - 1154 - 1155 which is not equal to 1.

    The answer is 1, but you should get into the habit of writing +1.
 
 
 
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