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
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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In a generic
ΔH∘rxn=cΔH∘f(C)+dΔH∘f(D) −aΔH∘f(A)−bΔH∘f(B)
Notice that the
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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