PREPARING F/YOUR ACS EXAM IN GEN CHEM
PREPARING F/YOUR ACS EXAM IN GEN CHEM
18th Edition
ISBN: 9781732776401
Author: EUBANKS
Publisher: American Chemical Society
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Chapter EN, Problem 13PQ
Interpretation Introduction

Interpretation:

ΔHfo of NH3 in following reaction has to be determined.

  4NH3(g)+5O2(g)4NO(g)+6H2O

Concept Introduction:

Standard enthalpy of reaction is calculated by summation of standard enthalpy of formation of the product minus the summation of standard enthalpy of formation of reactants at the standard conditions. The expression to calculate the standard enthalpy of reaction (ΔHrxn°) is as follows:

  ΔHrxn°=mΔHf (products)°nΔHf (reactants)°

Here,

  m is the stoichiometric coefficient of the product.

  n is the stoichiometric coefficient of reactant.

  ΔHf(reactants)° is the standard enthalpy of reactant formation.

  ΔHf(products)° is the standard enthalpy of product formation.

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