The average S – F bond energy in kJ mol^-1 of SF₆ is………… (Rounded off to the nearest integer) [Given : The values of standard enthalpy of formation of SF₆(g), S(g) and F(g) are – 1100, 275 and 80 kJ mol^-1 respectively.]

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alok kumar singh | Contributor-Level 10

3 weeks ago

$S (g) + 6 F (g) \to S F_{6} (g)$

$Δ {H^{0}}_{R} = Δ {H^{0}}_{f} (S F_{6}) - Δ {H^{0}}_{f} (S) - 6 \times Δ {H^{0}}_{f} (F)$

= (-1100) - (275) -6 (80) = -1855

$Δ {H^{0}}_{S - F} = \frac{1855}{6} = 309.16 K J / m o l ≅ 309$

<!- [if gte mso 9]><xml> <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1025" DrawAspect="Content" ObjectID="_1819548824"> </o:OLEObject></xml><! [endif]-> <math> <mrow> <mi>S</mi> <mrow> <mo> (</mo> <mrow> <mi>g</mi> </mrow> <mo>)</mo> </mrow> <mo>+</mo> <mn>6</mn> <mi>F</mi> <mrow> <mo> (</mo> <mrow> <mi>g</mi> </mrow> <mo>)</mo> </mrow> <mo>→</mo> <mi>S</mi> <msub> <mrow> <mi>F</mi> </mrow> <mrow> <mn>6</mn> </mrow> </msub> <mrow> <mo> (</mo> <mrow> <mi>g</mi> </mrow> <mo>)</mo> </mrow> </mrow> </math>   <math> <mrow> <mi>Δ</mi> <msub> <mrow> <msup> <mrow> <mi>H</mi> </mrow> <mrow> <mn>0</mn> </mrow> </msup> </mrow> <mrow> <mi>R</mi> </mrow> </msub> <mo>=</mo> <mi>Δ</mi> <msub> <mrow> <msup> <mrow> <mi>H</mi> </mrow> <mrow> <mn>0</mn> </mrow> </msup> </mrow> <mrow> <mi>f</mi> </mrow> </msub> <mrow> <mo> (</mo> <mrow> <mi>S</mi> <msub> <mrow> <mi>F</mi> </mrow> <mrow> <mn>6</mn> </mrow> </msub> </mrow> <mo>)</mo> </mrow> <mo>−</mo> <mi>Δ</mi> <msub> <mrow> <msup> <mrow> <mi>H</mi> </mrow> <mrow> <mn>0</mn> </mrow> </msup> </mrow> <mrow> <mi>f</mi> </mrow> </msub> <mrow> <mo> (</mo> <mrow> <mi>S</mi> </mrow> <mo>)</mo> </mrow> <mo>−</mo> <mn>6</mn> <mo>×</mo> <mi>Δ</mi> <msub> <mrow> <msup> <mrow> <mi>H</mi> </mrow> <mrow> <mn>0</mn> </mrow> </msup> </mrow> <mrow> <mi>f</mi> </mrow> </msub> <mrow> <mo> (</mo> <mrow> <mi>F</mi> </mrow> <mo>)</mo> </mrow> </mrow> </math>           <!- [if gte mso 9]><xml> <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1026" DrawAspect="Content" ObjectID="_1819548825"> </o:OLEObject></xml><! [endif]-> = (-1100) - (275) -6 (80) = -1855 <math> <mrow> <mi>Δ</mi> <msub> <mrow> <msup> <mrow> <mi>H</mi> </mrow> <mrow> <mn>0</mn> </mrow> </msup> </mrow> <mrow> <mi>S</mi> <mo>−</mo> <mi>F</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <mn>1</mn> <mn>8</mn> <mn>5</mn> <mn>5</mn> </mrow> <mrow> <mn>6</mn> </mrow> </mfrac> <mo>=</mo> <mn>3</mn> <mn>0</mn> <mn>9</mn> <mo>.</mo> <mn>1</mn> <mn>6</mn> <mi>K</mi> <mi>J</mi> <mo>/</mo> <mi>m</mi> <mi>o</mi> <mi>l</mi> <mo>≅</mo> <mn>3</mn> <mn>0</mn> <mn>9</mn> </mrow> </math>           <!- [if gte mso 9]><xml> <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1027" DrawAspect="Content" ObjectID="_1819548826"> </o:OLEObject></xml><! [endif]->

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The average S – F bond energy in kJ mol^-1 of SF₆ is………… (Rounded off to the nearest integer) [Given : The values of standard enthalpy of formation of SF₆(g), S(g) and F(g) are – 1100, 275 and 80 kJ mol^-1 respectively.]

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The average S – F bond energy in kJ mol-1 of SF6 is………… (Rounded off to the nearest integer) [Given : The values of standard enthalpy of formation of SF6(g), S(g) and F(g) are – 1100, 275 and 80 kJ mol-1 respectively.]

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The average S – F bond energy in kJ mol^-1 of SF₆ is………… (Rounded off to the nearest integer) [Given : The values of standard enthalpy of formation of SF₆(g), S(g) and F(g) are – 1100, 275 and 80 kJ mol^-1 respectively.]