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Chem 4 AQA question help

7(a)
Consider the following conversion. 1-4-Dinitrobenzene + [H] -------> 1,4-Diaminobenzene + H20

(i) Identify a reducing agent for this conversion.
- NaBH4

(ii)Write a balanced equation for the reaction using molecular formulae for the
nitrogen-containing compounds and [H] for the reducing agent.
Can som1 explain to me why the answer is 12[H]? Is it because 4 oxygen's are substituted for 4 hydrogen's , 2 hydrogen's are needed per oxygen to produce water? so 4 + 4(2) = 12?

The reason I'm asking this question is because obviously explaining it like that isn't sufficient lolz.

so revised equation is
1-4-Dinitrobenzene + 12[H] -------> 1,4-Diaminobenzene + 4H20 ?
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Secret.
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Original post by cuckoo99
7(a)
Consider the following conversion. 1-4-Dinitrobenzene + [H] -------> 1,4-Diaminobenzene + H20

(i) Identify a reducing agent for this conversion.
- NaBH4

(ii)Write a balanced equation for the reaction using molecular formulae for the
nitrogen-containing compounds and [H] for the reducing agent.
Can som1 explain to me why the answer is 12[H]? Is it because 4 oxygen's are substituted for 4 hydrogen's , 2 hydrogen's are needed per oxygen to produce water? so 4 + 4(2) = 12?

The reason I'm asking this question is because obviously explaining it like that isn't sufficient lolz.

so revised equation is
1-4-Dinitrobenzene + 12[H] -------> 1,4-Diaminobenzene + 4H20 ?


It goes from dinitro 2 NO2 to diamino 2 NH2 so that means you need 4 Hydrogen atoms

Then you need to balance the oxygens so as you have 4, you produce 4 H2Os (8 hydrogen atoms needed) so that's correct

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