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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Using standard enthalpies of formation, verify that 2680 kJ of energy is released in combustion of 100.0 g of ethanol.

C2H5OH() + 3 O2(g) → 2 CO2(g) + 3 H2O(g)

Interpretation Introduction

Interpretation:

To verify the amount of energy released during the combustion of ethanol is 2680J

Concept Introduction:

The standard enthalpy change of combustion of a compound is the enthalpy change which occurs when one gram of the compound is burned completely in oxygen under standard conditions, and with everything in its standard state.

              ΔrH0imagesΣnΔfH0(products)-ΣnΔfH0(reactants)

Explanation

Given constant are:

Formation constant of CO2is-393.5kJ/mol

Formation constant of H2Ois-285.83kJ/mol

Formation constant of C2H5OHis235.14kJ/mol

Molar mass of ethanol is 46.07g

Substitute the values in ΔrH0ΣnΔfH0(products)-ΣnΔfH0(reactants)

ΔrH0

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