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in Chemical Thermodynamics by (80.9k points)
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How much energy is released when 6 moles of octane is burnt in air? Given;ΔHfo for CO2(g), H2O(g) and C8H18(l) respectively are - 490, -240 and +160 kJ/mol.

(a) - 6.22 kJ 

(b) 37440 kJ/mol

(c) 35502 kJ 

(d) - 20.0 kJ

1 Answer

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Best answer

Correct option   (b) 37440 kJ/mol

Explanation:

Adding equations (i) and (ii) and subtracting (iii), we get

by (10 points)
Why 160 is taken as negative

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