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Properties of Enthalpy

The value of ...

Question

The value of standard enthalpy of formation of $S F_{6} (g), S (g) a n d F (g) a r e - 1100, 275, 80 k J / m o l$ respectively. The average bond energy of $S F_{6}$ (in kJ/mol) is
(Give your answer upto two decimal points)

A

309.16

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B

309.2

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C

309.17

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Solution

$S F_{6} (g) \to S (g) + 6 F (g)$
$Δ H_{f}^{o} = H_{f}^{o} p r o d u c t s - H_{f r e a c t a n t s}^{o}$
$Δ H_{f}^{o} = (275 + 80 \times 6) - (- 1100)$
$Δ H_{f}^{o} = 1855 k J / m o l$
The average bond energy in $S F_{6}$ will be = $\frac{1855 k J / m o l}{6} = 309.16 k J / m o l$

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Properties of Enthalpy

Standard XII Chemistry

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