Calculate ΔHcombustion ∘ of C(graphite) if ΔHf∘ of acetone=−250kJ,ΔHcombustion ∘ of acetone =−1760kJΔHcombustion ∘ of H2(g)=−280kJ :

In the reaction we have,CH3COCH3+4O2⟶3CO2(g)+3H2O(l) −1760=3×ΔHfCO2+3(−280)+250ΔHfCO2=−390kJ/mol

Calculate ΔHcombustion ∘ of C(graphite) if ΔHf∘ of acetone=−250kJ,ΔHcombustion ∘ of acetone =−1760kJΔHcombustion ∘ of H2(g)=−280kJ :

In the reaction we have,CH3COCH3+4O2⟶3CO2(g)+3H2O(l) −1760=3×ΔHfCO2+3(−280)+250ΔHfCO2=−390kJ/mol

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Calculate $Δ H_{combustion}^{\circ} of C_{(graphite)} if Δ H_{f}^{\circ}$ of acetone
$= - 250 kJ, Δ H_{combustion}^{\circ}$ of acetone $= - 1760 kJ$
$Δ H_{combustion}^{\circ}$ of $H_{2} (g) = - 280 kJ$ :

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$- 390 kJ$

$- 120 kJ$

$- 500 kJ$

$- 200 kJ$

answer is A.

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Detailed Solution

In the reaction we have,

$\begin{array}{l} {CH}_{3} {COCH}_{3} + 4 O_{2} ⟶ 3 {CO}_{2} (g) + 3 H_{2} O (l) \\ - 1760 = 3 \times Δ H_{f} ({CO}_{2}) + 3 (- 280) + 250 \\ Δ H_{f} ({CO}_{2}) = - 390 kJ / mol \end{array}$

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Calculate ΔHcombustion ∘ of C(graphite) if ΔHf∘ of acetone=−250kJ,ΔHcombustion ∘ of acetone =−1760kJΔHcombustion ∘ of H2(g)=−280kJ :

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Calculate $Δ H_{combustion}^{\circ} of C_{(graphite)} if Δ H_{f}^{\circ}$ of acetone
$= - 250 kJ, Δ H_{combustion}^{\circ}$ of acetone $= - 1760 kJ$
$Δ H_{combustion}^{\circ}$ of $H_{2} (g) = - 280 kJ$ :