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Difference between Internal Energy and Enthalpy

The heat of d...

Question

The heat of dissociation (in kcal/mol) of $C H_{4}$ and $C_{2} H_{6}$ are 360 and 620 respectively. From this, the $C - C$ bond energy in the ethane can be evaluated as:

260

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130

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200

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Solution

The correct option is C 80
$C H_{4} (g) \to C (s) + 2 H_{2} (g); Δ H = 360 k c a l$
$C_{2} H_{6} (g) \to 2 C (s) + 3 H_{2} (g); Δ H = 620 k c a l$

$4 \times (C - H) = 360 k c a l$
$C - H = 90 k c a l$
$C - C + 6 \times (C - H) = 620$

$C - C + 540 = 620$
$C - C = 80 k c a l$

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