Calculate ΔH for the following reaction:

8 Al(s) + 3 Fe₃O₄(s) --> 4 Al₂O₃(s) + 9 Fe(s)

Question

Calculate &Delta;H for the following reaction: 8 Al(s) + 3 Fe 3 O 4 (s) --> 4 Al 2 O 3 (s) + 9 Fe(s)

SAGAR SINGH - IIT DELHI · Answer

Dear sachin, &Delta;H for a reaction is equal to the sum of the heats of formation of the product compounds minus the sum of the heats of formation of the reactant compounds: &Delta;H = &Sigma; &Delta;H f products - &Sigma; &Delta;H f reactants Omitting terms for the elements, the equation becomes: &Delta;H = 4 &Delta;H f Al 2 O 3 (s) - 3 &Delta;H f Fe 3 O 4 (s) The values for &Delta;H f may be found in the Heats of Formation of Compounds table. Plugging in these numbers: &Delta;H = 4(-1669.8 kJ) - 3(-1120.9 kJ) &Delta;H = -3316.5 kJ Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation. All the best. Win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian. Now you score 5+15 POINTS by uploading your Pic and Downloading the Askiitians Toolbar respectively : Click here to download the toolbar.. Askiitians Expert Sagar Singh B.Tech, IIT Delhi

pratik nayak · Answer

&Delta;H for a reaction is the sum of the heats of formation of the product compounds - the sum of the heats of formation of the reactant compounds: &Delta;H = &Sigma; &Delta;H f products - &Sigma; &Delta;H f reactants &Delta;H = 4 &Delta;H f Al 2 O 3 (s) - 3 &Delta;H f Fe 3 O 4 (s) The values for &Delta;H f are present in the Heats of Formation of Compounds table. &Delta;H = 4(-1669.8 kJ) - 3(-1120.9 kJ) &Delta;H = -3316.5 kJ please approve my answer if u like it

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Calculate ΔH for the following reaction: 8 Al(s) + 3 Fe 3 O 4 (s) --> 4 Al 2 O 3 (s) + 9 Fe(s)

Calculate ΔH for the following reaction:

8 Al(s) + 3 Fe₃O₄(s) --> 4 Al₂O₃(s) + 9 Fe(s)

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Calculate ΔH for the following reaction: 8 Al(s) + 3 Fe 3 O 4 (s) --> 4 Al 2 O 3 (s) + 9 Fe(s)

Calculate ΔH for the following reaction: 8 Al(s) + 3 Fe3O4(s) --> 4 Al2O3(s) + 9 Fe(s)

2 Answers

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Calculate ΔH for the following reaction:

8 Al(s) + 3 Fe₃O₄(s) --> 4 Al₂O₃(s) + 9 Fe(s)