## Learning Goal:To understand how standard enthalpy of reaction is related to the standard heats of formation of the reactants and products.---The standard enthalpy of reaction is the enthalpy change that occurs in a reaction when all the reactants and products are in their standard states. The symbol for the standard enthalpy of reaction is $\Delta H^\circ_{\text{rxn}}$, where the subscript “rxn” stands for “reaction”. The standard enthalpy of a reaction is calculated from the standard heats of formation ($\Delta H^\circ_f$) of its reactants and products. Therefore, the standard enthalpy $\Delta H^\circ_{\text{rxn}}$ of any reaction can be mathematically determined, as long as the standard heats of formation ($\Delta H^\circ_f$) of its reactants and products are known.---In a generic chemical reaction involving reactants A and B and products C and D, $aA + bB \rightarrow cC + dD$, the standard enthalpy $\Delta H^\circ_{\text{rxn}}$ of the reaction is given by:\[\Delta H^\circ_{\text{rxn}} = c\Delta H^\circ_f (C) + d\Delta H^\circ_f (D) - a\Delta H^\circ_f (A) - b\Delta H^\circ_f (B)\]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:\[\Delta H^\circ_{\text{rxn}} = \sum_{\text{products}} n \Delta H^\circ_f - \sum_{\text{reactants}} m \Delta H^\circ_f\]where $m$ and $n$ represent the appropriate stoichiometric coefficients for each substance.---### Part A:What is $\Delta H^\circ_{\text{rxn}}$ for the following chemical reaction?\[ H_2O(l) + CCl_4(l) \rightarrow COCl_2(g) + 2HCl(g) \]You can use the following table of standard heats of formation (\

The balanced reaction taking place is => H2O (l) + CCl4 (l) -------> COCl2 (g) + 2 HCl (g)

In a generic chemical reaction involving reactants A and B and products C and D, aA + bB¬cC+dD, the standard enthalpy AHm of the reaction is given by ΔΗΔΗ; (C) + dΔH (D) -ΔH (A)- bΔΗ (Β) 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: where m and na represent the appropriate stoichiometric coeficients for each substance. Part A What is AHim for the following chemical reaction? H2O(1) + CCL4 (1)→COCI2 (g) + 2HC1(g) You can use the following table of standard heats of formation (AH; ) to calculate the enthalpy of the given reaction. Standard Heat of Standard Heat of Element/ Compound Element/ Compound Formation (kJ/mol) Formation (kJ/mol) H(g) 218 N(g) 473 H2(g) O2(8) CCL (1) -139.5 O(g) 249 H2O(1) -285.8 HCI(g) -92.30kJ C(g) 71 COC2(g) -218.8kJ C(s) HNO:(aq) -206.6

In a generic chemical reaction involving reactants A and B and products C and D, aA + bB¬cC+dD, the standard enthalpy AHm of the reaction is given by ΔΗΔΗ; (C) + dΔH (D) -ΔH (A)- bΔΗ (Β) 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: where m and na represent the appropriate stoichiometric coeficients for each substance. Part A What is AHim for the following chemical reaction? H2O(1) + CCL4 (1)→COCI2 (g) + 2HC1(g) You can use the following table of standard heats of formation (AH; ) to calculate the enthalpy of the given reaction. Standard Heat of Standard Heat of Element/ Compound Element/ Compound Formation (kJ/mol) Formation (kJ/mol) H(g) 218 N(g) 473 H2(g) O2(8) CCL (1) -139.5 O(g) 249 H2O(1) -285.8 HCI(g) -92.30kJ C(g) 71 COC2(g) -218.8kJ C(s) HNO:(aq) -206.6

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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