Question 23 please **Question 23**The enthalpy of reaction for the combustion of C to CO₂ is -393.5 kJ/mol C, and the enthalpy for the combustion of CO to CO₂ is -283.0 kJ/mol CO.(i) \( \text{C(s) + O}_2\text{(g)} \rightarrow \text{CO}_2\text{(g)} \quad \Delta H = -393.5 \, \text{kJ} \)(ii) \( 2\text{CO(g)} + \text{O}_2\text{(g)} \rightarrow 2\text{CO}_2\text{(g)} \quad \Delta H = -283.0 \, \text{kJ} \)Using these data, calculate the enthalpy for the combustion of C to CO:(iii) \( 2\text{C(s)} + \text{O}_2\text{(g)} \rightarrow 2\text{CO(g)} \quad \Delta H = ? \)- A. -787.0 kJ- B. -504.0 kJ- C. 1070 kJ- D. None of the above

The reactions given are, 1) C (s) + O2 (g) ------> CO2 (g) ΔH = -393.5 KJ 2) 2 CO (g) + O2 (g) ------> 2 CO2 (g) ΔH = -283.0 KJ Since we need 2 C in the reactant side in the final reaction (iii). Hence multiplying reaction (1) with 2 to get (on multiplying any reaction with a constant, the ΔH of the reaction also gets multiplied by same constant as per the Hess's law), 3) 2 C (s) + 2 O2 (g) ------> 2 CO2 (g) ΔH = -393.5 X 2 = -787.0 KJ Now subtracting reaction 2 from 3 to eliminate CO2 from the reactions and get the final reaction as (on subtracting reactions, the ΔH of reaction also gets subtracted), => 2 C (s) + O2 (g) ------> 2 CO (g) ΔH = -787.0 - (-283.0) = -504.0 KJ Hence the answer is option B. -504.0 KJ.

Science

Chemistry

The enthalpy of reaction for the combustion of C to CO2 is -393.5 kJ/mol C, and the enthalpy for the combustion of CO to CO2 is -283.0 kJ/mol CO: (i) C(S) + 02(g) → CO2(g) (ii) AH =-393.5 kJ 2CO(g) + 02g) → 2CO2(g) AH=-283.0 kJ Using these data, calculate the enthalpy for the combustion ofC to CO: (ii) 2C(s) + 02(g) → 2CO(g) AH=? OA.-787.0 KJ O B. -504.0 KJ OC. 1070 KJ O D. none of the above.

The enthalpy of reaction for the combustion of C to CO2 is -393.5 kJ/mol C, and the enthalpy for the combustion of CO to CO2 is -283.0 kJ/mol CO: (i) C(S) + 02(g) → CO2(g) (ii) AH =-393.5 kJ 2CO(g) + 02g) → 2CO2(g) AH=-283.0 kJ Using these data, calculate the enthalpy for the combustion ofC to CO: (ii) 2C(s) + 02(g) → 2CO(g) AH=? OA.-787.0 KJ O B. -504.0 KJ OC. 1070 KJ O D. none of the above.

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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