Determine the standard enthalpy of formation for NO given the following information about the formation of NO 2 under standard conditions, and (NO 2 ) 33.2 kJ/mol. 2NO(g) O 2 (g) 2NO 2 (g) $~~~~~~~~$$\Delta$H rxn 114.2 kJ

We can use Hess's Law of Summation to find the enthalpy of formation of NO: 1. Reverse the second equation and multiply it by -1 to get: O 2 (g) + 2NO(g) -> 2NO 2 (g) ΔH = -33.2 kJ/mol 2. Add the first equation to the previous one to obtain the desired equation: 2NO 2 (g) -> 2NO(g) + O 2 (g) ΔH = (-33.2 kJ/mol) + (114.2 kJ/mol) = 81.0 kJ/mol 3. Use the enthalpy of formation of O 2 (g) = 0 kJ/mol to find the enthalpy of formation of NO: ΔHf°(NO) = (1/2) [ΔHf°(2NO)] = (1/2) [2(81.0 kJ/mol)] = 90.3 kJ/mol Therefore, the correct answer is A.

Determine the standard enthalpy of formation for NO given the following information about the formation of NO 2 under standard conditions, and (NO 2 ) 33.2 kJ/mol. 2NO(g) O 2 (g) 2NO 2 (g) $~~~~~~~~$$\Delta$H rxn 114.2 kJ

We can use Hess's Law of Summation to find the enthalpy of formation of NO: 1. Reverse the second equation and multiply it by -1 to get: O 2 (g) + 2NO(g) -> 2NO 2 (g) ΔH = -33.2 kJ/mol 2. Add the first equation to the previous one to obtain the desired equation: 2NO 2 (g) -> 2NO(g) + O 2 (g) ΔH = (-33.2 kJ/mol) + (114.2 kJ/mol) = 81.0 kJ/mol 3. Use the enthalpy of formation of O 2 (g) = 0 kJ/mol to find the enthalpy of formation of NO: ΔHf°(NO) = (1/2) [ΔHf°(2NO)] = (1/2) [2(81.0 kJ/mol)] = 90.3 kJ/mol Therefore, the correct answer is A.

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Determine the Standard Enthalpy of Formation for NO Given the Following

Question 113

Multiple Choice

Determine the standard enthalpy of formation for NO given the following information about the formation of NO₂ under standard conditions, and
$Determine the standard enthalpy of formation for NO given the following information about the formation of NO2 under standard conditions, and (NO2) 33.2 kJ/mol. 2NO(g) O2(g) 2NO2(g) ~~~~~~~~\Delta Hrxn 114.2 kJ A) (90.3 kJ/mol) B) ( 90.3 kJ/mol) C) ( 147.4 kJ/mol) D) ( 180.6 kJ/mol) E) ( 73.7 kJ/mol)$ $Determine the standard enthalpy of formation for NO given the following information about the formation of NO2 under standard conditions, and (NO2) 33.2 kJ/mol. 2NO(g) O2(g) 2NO2(g) ~~~~~~~~\Delta Hrxn 114.2 kJ A) (90.3 kJ/mol) B) ( 90.3 kJ/mol) C) ( 147.4 kJ/mol) D) ( 180.6 kJ/mol) E) ( 73.7 kJ/mol)$ (NO₂) $Determine the standard enthalpy of formation for NO given the following information about the formation of NO2 under standard conditions, and (NO2) 33.2 kJ/mol. 2NO(g) O2(g) 2NO2(g) ~~~~~~~~\Delta Hrxn 114.2 kJ A) (90.3 kJ/mol) B) ( 90.3 kJ/mol) C) ( 147.4 kJ/mol) D) ( 180.6 kJ/mol) E) ( 73.7 kJ/mol)$ 33.2 kJ/mol. 2NO(g) $Determine the standard enthalpy of formation for NO given the following information about the formation of NO2 under standard conditions, and (NO2) 33.2 kJ/mol. 2NO(g) O2(g) 2NO2(g) ~~~~~~~~\Delta Hrxn 114.2 kJ A) (90.3 kJ/mol) B) ( 90.3 kJ/mol) C) ( 147.4 kJ/mol) D) ( 180.6 kJ/mol) E) ( 73.7 kJ/mol)$ O₂(g) $Determine the standard enthalpy of formation for NO given the following information about the formation of NO2 under standard conditions, and (NO2) 33.2 kJ/mol. 2NO(g) O2(g) 2NO2(g) ~~~~~~~~\Delta Hrxn 114.2 kJ A) (90.3 kJ/mol) B) ( 90.3 kJ/mol) C) ( 147.4 kJ/mol) D) ( 180.6 kJ/mol) E) ( 73.7 kJ/mol)$ 2NO₂(g) $~~~~~~~~$ $\Delta$ H_rxn $Determine the standard enthalpy of formation for NO given the following information about the formation of NO2 under standard conditions, and (NO2) 33.2 kJ/mol. 2NO(g) O2(g) 2NO2(g) ~~~~~~~~\Delta Hrxn 114.2 kJ A) (90.3 kJ/mol) B) ( 90.3 kJ/mol) C) ( 147.4 kJ/mol) D) ( 180.6 kJ/mol) E) ( 73.7 kJ/mol)$ 114.2 kJ

A) (90.3 kJ/mol)
B) ( $Determine the standard enthalpy of formation for NO given the following information about the formation of NO2 under standard conditions, and (NO2) 33.2 kJ/mol. 2NO(g) O2(g) 2NO2(g) ~~~~~~~~\Delta Hrxn 114.2 kJ A) (90.3 kJ/mol) B) ( 90.3 kJ/mol) C) ( 147.4 kJ/mol) D) ( 180.6 kJ/mol) E) ( 73.7 kJ/mol)$ 90.3 kJ/mol)
C) ( $Determine the standard enthalpy of formation for NO given the following information about the formation of NO2 under standard conditions, and (NO2) 33.2 kJ/mol. 2NO(g) O2(g) 2NO2(g) ~~~~~~~~\Delta Hrxn 114.2 kJ A) (90.3 kJ/mol) B) ( 90.3 kJ/mol) C) ( 147.4 kJ/mol) D) ( 180.6 kJ/mol) E) ( 73.7 kJ/mol)$ 147.4 kJ/mol)
D) ( $Determine the standard enthalpy of formation for NO given the following information about the formation of NO2 under standard conditions, and (NO2) 33.2 kJ/mol. 2NO(g) O2(g) 2NO2(g) ~~~~~~~~\Delta Hrxn 114.2 kJ A) (90.3 kJ/mol) B) ( 90.3 kJ/mol) C) ( 147.4 kJ/mol) D) ( 180.6 kJ/mol) E) ( 73.7 kJ/mol)$ 180.6 kJ/mol)
E) ( $Determine the standard enthalpy of formation for NO given the following information about the formation of NO2 under standard conditions, and (NO2) 33.2 kJ/mol. 2NO(g) O2(g) 2NO2(g) ~~~~~~~~\Delta Hrxn 114.2 kJ A) (90.3 kJ/mol) B) ( 90.3 kJ/mol) C) ( 147.4 kJ/mol) D) ( 180.6 kJ/mol) E) ( 73.7 kJ/mol)$ 73.7 kJ/mol)

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