AQA A-level Chemistry 2020 Paper 3 (1st half) walkthrough

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AQA A-level Chemistry 2020 Paper 3 (1st half) walkthrough
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At 35:38, why do you times the moles of hexane by 4154? Should you not do (1/moles of hexane) times 4154 to workout how much energy released with that amount of moles?

gaanavmanyam
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At 36:57, don't you divide 96.6 by 285.5 kelvin instead of 12.4 degrees celsius? Because Ccal's unit is KJ K -1.

zohairasimhabib
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At 49:25, wouldn't the Ecell value be -0.88 - +0.34 = -1.22 V, as the secondary standard copper electrode would be placed on the left? Or does this rule only apply for the SHE?

siobhanhall