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In a generic chemical reaction involving reactants A and B and products C and D, aA+bB→cC+dD, the standard enthalpy ΔH∘rxn of the reaction is given by ΔH∘rxn=cΔH∘f(C)+dΔH∘f(D) −aΔH∘f(A)−bΔH∘f(B) Notice that the stoichiometric coefficients, a, b, c, d, are an important part of this equation. This formula is often generalized as follows, where the first sum on the right-hand side of the equation is a sum over the products and the second sum is over the reactants: ΔH∘rxn=∑productsnΔH∘f−∑reactantsmΔH∘f where m and n represent the appropriate stoichiometric coefficients for each substance. What is ΔH∘rxnΔHrxn∘ for the following chemical reaction? CO(g)+NH3(g)→HCN(g)+H2O(g) You can use the following table of standard heats of formation (ΔH∘f)(ΔHf∘) to calculate the enthalpy of the given reaction.   Element/ Compound Standard Heat of Formation (kJ/mol) Element/ Compound Standard Heat of Formation (kJ/mol) H(g) 218218 N(g) 473473 H2(g) 00 O2(g) 00 NH3(g) −45.90 O(g) 249 CO(g) −110.5 H2O(g) −241.8kJ C(g) 7171 HCN(g) 130.5kJ C(s) 00 HNO3(aq) −206.6   Express the standard enthalpy of reaction to three significant figures and include the appropriate units.

In a generic chemical reaction involving reactants A and B and products C and D, aA+bB→cC+dD, the standard enthalpy ΔH∘rxn of the reaction is given by ΔH∘rxn=cΔH∘f(C)+dΔH∘f(D) −aΔH∘f(A)−bΔH∘f(B) Notice that the stoichiometric coefficients, a, b, c, d, are an important part of this equation. This formula is often generalized as follows, where the first sum on the right-hand side of the equation is a sum over the products and the second sum is over the reactants: ΔH∘rxn=∑productsnΔH∘f−∑reactantsmΔH∘f where m and n represent the appropriate stoichiometric coefficients for each substance. What is ΔH∘rxnΔHrxn∘ for the following chemical reaction? CO(g)+NH3(g)→HCN(g)+H2O(g) You can use the following table of standard heats of formation (ΔH∘f)(ΔHf∘) to calculate the enthalpy of the given reaction.   Element/ Compound Standard Heat of Formation (kJ/mol) Element/ Compound Standard Heat of Formation (kJ/mol) H(g) 218218 N(g) 473473 H2(g) 00 O2(g) 00 NH3(g) −45.90 O(g) 249 CO(g) −110.5 H2O(g) −241.8kJ C(g) 7171 HCN(g) 130.5kJ C(s) 00 HNO3(aq) −206.6   Express the standard enthalpy of reaction to three significant figures and include the appropriate units.

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter4: Energy And Chemical Reactions
Section: Chapter Questions
Problem 118QRT
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In a generic chemical reaction involving reactants A and B and products C and D, aA+bB→cC+dD, the standard enthalpy ΔH∘rxn of the reaction is given by

ΔH∘rxn=cΔH∘f(C)+dΔH∘f(D) −aΔH∘f(A)−bΔH∘f(B)

Notice that the stoichiometric coefficients, a, b, c, d, are an important part of this equation. This formula is often generalized as follows, where the first sum on the right-hand side of the equation is a sum over the products and the second sum is over the reactants:

ΔH∘rxn=∑productsnΔH∘f−∑reactantsmΔH∘f

where m and n represent the appropriate stoichiometric coefficients for each substance.

What is ΔH∘rxnΔHrxn∘ for the following chemical reaction?

CO(g)+NH3(g)→HCN(g)+H2O(g)

You can use the following table of standard heats of formation (ΔH∘f)(ΔHf∘) to calculate the enthalpy of the given reaction.

 

Element/ Compound Standard Heat of Formation (kJ/mol) Element/ Compound Standard Heat of Formation (kJ/mol)
H(g) 218218 N(g) 473473
H2(g) 00 O2(g) 00
NH3(g) −45.90 O(g) 249
CO(g) −110.5 H2O(g) −241.8kJ
C(g) 7171 HCN(g) 130.5kJ
C(s) 00 HNO3(aq) −206.6

 

Express the standard enthalpy of reaction to three significant figures and include the appropriate units.

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