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Q.

If the enthalpy of combustion of benzene(l) carbon(s) and hydrogen (g) are Q1 , Q2 and Q3 respectively, what will be enthalpy of formation of Benzene?

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a

$Q_{1} + 6 Q_{2} + Q_{3}$

b

$6 Q_{2} + Q_{1} + 3 Q_{3}$

c

$6 Q_{2} - 3 Q_{3} - Q_{1}$

d

$6 Q_{2} + 3 Q_{3} - Q_{1}$

answer is D.

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Detailed Solution

$C_{6} H_{6} (l) + \frac{15}{2} O_{2} (g) ⟶ 6 {CO}_{2} (g) + 3 H_{2} O (l)$

$6 \times Q_{2} + 3 \times Q_{3} - x = Q_{1}$

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