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Types of enthalpies of reaction

The standard enthalpies of formation of {CO}_{2}({~g}), {H}_{2

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The standard enthalpies of formation of $CO_{2} (g), H_{2} O (l)$ , and glucose(s) at $2 5^{\circ} C$ are $- 400 kJ / mol, - 300 kJ / mol$ , and $- 1300$ $kJ / mol$ , respectively. The standard enthalpy of combustion per gram of glucose at $2 5^{\circ} C$ is

+ 2900 kJ

- 16.11 kJ

- 2900 kJ

+ 16.11 kJ

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Updated on: Feb 28, 2023

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The standard enthalpies of formation of

CO_{2} (g), H_{2} O (l)

, and glucose(s) at

2 5^{\circ} C

are

- 400 kJ / mol, - 300 kJ / mol

, and

- 1300

kJ / mol

, respectively. The standard enthalpy of combustion per gram of glucose at

2 5^{\circ} C

10 mins ago

Discuss this question LIVE

10 mins ago

Text solutionVerified

Consider the following reaction,

C_{6} H_{12} O_{6} (s) + 6 O_{2} (g) \to 6 CO_{2} (g) + 6 H_{2} O (l)

The standard enthalpy of the combustion of glucose can be calculated by the equation.

Δ H_{C} = Δ H_{f} (Product) - Δ H_{f} (Reatant)

Δ H_{C} = [(6 \times Δ H_{f} (CO_{2})) + (6 \times Δ H_{f} (H_{2} O))] - Δ H_{f} [C_{6} H_{12} O_{6}]

Δ H_{C} = 6 (- 400) + 6 (- 300) - (- 1300) = - 2900 kJ / mol

For one gram of glucose, enthalpy of combustion

Δ H^{\circ} = - \frac{2900}{180} = - 16.11 kJ / gm

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Question Text	The standard enthalpies of formation of $CO_{2} (g), H_{2} O (l)$ , and glucose(s) at $2 5^{\circ} C$ are $- 400 kJ / mol, - 300 kJ / mol$ , and $- 1300$ $kJ / mol$ , respectively. The standard enthalpy of combustion per gram of glucose at $2 5^{\circ} C$ is
Updated On	Feb 28, 2023
Topic	Thermodynamics and Thermochemistry
Subject	Chemistry
Class	Class 11
Answer Type	Text solution:1 Video solution: 6
Upvotes	649
Avg. Video Duration	11 min

The standard enthalpies of formation of $CO_{2} (g), H_{2} O (l)$ , and glucose(s) at $2 5^{\circ} C$ are $- 400 kJ / mol, - 300 kJ / mol$ , and $- 1300$ $kJ / mol$ , respectively. The standard enthalpy of combustion per gram of glucose at $2 5^{\circ} C$ is

Text solutionVerified

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The standard enthalpies of formation of CO2​( g),H2​O(l), and glucose(s) at 25∘C are −400 kJ/mol,−300 kJ/mol, and −1300 kJ/mol, respectively. The standard enthalpy of combustion per gram of glucose at 25∘C is

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The standard enthalpies of formation of $CO_{2} (g), H_{2} O (l)$ , and glucose(s) at $2 5^{\circ} C$ are $- 400 kJ / mol, - 300 kJ / mol$ , and $- 1300$ $kJ / mol$ , respectively. The standard enthalpy of combustion per gram of glucose at $2 5^{\circ} C$ is