1. Calculate the enthalpy of reaction for the reaction of nitrogen dioxide with
ID: 704518 • Letter: 1
Question
1. Calculate the enthalpy of reaction for the reaction of nitrogen dioxide with water represented by the following equation:
3 NO2(g) + H2O(l) ?2 HNO3(aq) + NO(g) ?rH=?
Use the following information to answer Question 1
Given the following reactions:
Reaction I
2 NO(g) + O2(g) ?2 NO2(g) ?rH = -173 kJ
Reaction II
2 N2(g) + 5 O2(g) + 2 H2O(l)?4 HNO3(aq) ?rH = -255 kJ
Reaction III
N2(g) + O2(g) ?2 NO(g) ?rH= +181 kJ
2. Calculate the enthalpy of reaction for the reaction of nitrogen dioxide with water represented by the following equation:
3 NO2(g) + H2O(l) ?2 HNO3(aq) + NO(g) ?rH=?
Given the following reactions:
Reaction I
2 NO(g) + O2(g) ?2 NO2(g) ?rH = -173 kJ
Reaction II
2 N2(g) + 5 O2(g) + 2 H2O(l)?4 HNO3(aq) ?rH = -255 kJ
Reaction III
N2(g) + O2(g) ?2 NO(g) ?rH= +181 kJ
Explanation / Answer
Ans :
The enthalpy of the desired reaction can be determined usinh Hess's law.
The desired reaction can be obtained by :
= (reverse of 1.5 times of reaction 1) + ( half of reaction 2 ) + (reverse of reaction 3)
So the enthalpy of the desired reaction = (173 x 1.5) + (-255/2) + (-181)
= -49 KJ
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