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Standard XII

Chemistry

Difference between Internal Energy and Enthalpy

The standard ...

Question

The standard heat of formation values of $S F_{6} (g), S (g)$ and $F (g)$ are $- 1100, 275$ and $80$ J mol $^{- 1}$ respecitvely. The $S - F$ bond energy in $S F_{6}$ is :

309.2 kJ

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378.2 kJ

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284.6 kJ

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261.8 kJ

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Solution

The correct option is B 309.2 kJ
$S F_{6} (g) \to S (g) + 6 F (g)$

$Δ H$ of reaction $=$ $275 + 3 \times 80 + 1100 + 3 \times 80$ = $275 + 240 + 1100 + 240$

$=$ $1615 k J m o l^{- 1} + 240 = 1855 k J m o l^{- 1}$

$6 \times (S - F)$ bond energy $=$ $1855$

$(S - F)$ bond energy $= \frac{1855}{6}$ $≃$ $309.2$ kJ

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Similar questions

The standard heat of formation values of $S F_{6} (g)$ , $S (g)$ and $F (g)$ are: $- 1100, 275$ and $80 K J m o l^{- 1}$ respectively. Then the average S - F bond energy in $S F_{6}$ is:

Q. The average

S - F

bond energy in

k J m o l^{- 1}

S F_{6}

is _____.(Rounded off to the nearest integer

[Given : The values of standard enthalpy of formation of

S F_{6} (g), S (g) a n d F (g)

are - 1100, 275 and 80 kJ

m o l^{- 1}

respectively]

Q. The average S–F bond energy in

k J m o l^{- 1}

S F_{6}

is______. (Rounded off to the nearest integer)
[Given : The values of standard enthalpy of formation of

S F_{6} (g), S (g) and F (g) are 1100, 275 and 80 k J m o l^{- 1}

respectively.]

Q. The value of standard enthalpy of formation of

S F_{6} (g) S (g)

and

F (g)

are

- 1100, 275

and

80 k J m o l^{- 1}

respectively. The average

S - F

bond ethalpy is

S F_{6}

is :

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The standard heat of formation values of SF6(g), S(g) and F(g) are −1100, 275 and 80 J mol−1 respecitvely. The S−F bond energy in SF6 is :

The correct option is B 309.2 kJSF6(g)→S(g)+6F(g)ΔH of reaction = 275+3×80+1100+3×80 = 275+240+1100+240= 1615 kJmol−1+240=1855 kJmol−1 6×(S−F) bond energy = 1855(S−F) bond energy =18556 ≃ 309.2 kJ

The standard heat of formation values of $S F_{6} (g), S (g)$ and $F (g)$ are $- 1100, 275$ and $80$ J mol $^{- 1}$ respecitvely. The $S - F$ bond energy in $S F_{6}$ is :