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Standard XII

Chemistry

Heat of Formation

Estimate the ...

Question

Estimate the average $S - F$ bond energy in $S F_{6}$ . The standard heat of formation values of $S F_{6 (g)} . S_{(g)}$ and $F_{(g)}$ are $1100$ , $275$ and $80 K J / m o l e$ respectively.

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Solution

${S F_{6}}_{(g)} ⟶ S_{(g)} + F_{(g)}$
${Δ H}_{r e a c t i o n} = {\sum {Δ H^{0}}_{f}}_{P r o d u c t} - {\sum {Δ H^{0}}_{f}}_{R e a c t a n t}$
${Δ H}_{r e a c t i o n} = (275 + 6 \times 80) - 1100$
${Δ H}_{r e a c t i o n} = 865 K J / m o l$
$∴$ Average bond energy $= \frac{{Δ H}_{r e a c t i o n}}{Total no. of bonds} = \frac{865}{6} = 144.16 K J / m o l$
Hence the average $S - F$ bond energy in $S F_{6}$ is $144.16 K J / m o l$ .

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Estimate the average S−F bond energy in SF6. The standard heat of formation values of SF6(g).S(g) and F(g) are 1100, 275 and 80 KJ/mole respectively.

SF6(g)⟶S(g)+F(g)ΔHreaction=∑ΔH0fProduct−∑ΔH0fReactantΔHreaction=(275+6×80)−1100ΔHreaction=865KJ/mol∴ Average bond energy =ΔHreactionTotal no. of bonds=8656=144.16KJ/molHence the average S−F bond energy in SF6 is 144.16KJ/mol.

Estimate the average $S - F$ bond energy in $S F_{6}$ . The standard heat of formation values of $S F_{6 (g)} . S_{(g)}$ and $F_{(g)}$ are $1100$ , $275$ and $80 K J / m o l e$ respectively.