Please send help, i understand hess law has to be used here but i cant get the a

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junior college 2 | H3 Maths
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junior college 2 H3 Maths Singapore

Please send help, i understand hess law has to be used here but i cant get the answer which is option E. Can anyone pls send their working ? Thanks!

Date Posted: 2 years ago

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Date Posted: 2 years ago