University Admission Chemistry Exam
Question 1 of 30
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Consider the reaction: \(2\text{NO}(g) + \text{O}_2(g) \rightarrow 2\text{NO}_2(g)\). The standard enthalpy change of reaction is \(\Delta H^\circ = -114\,\text{kJ}\) for the equation as written. Which statement is correct?
Select one option.
A
The reaction is endothermic because gases are consumed.
B
The reaction absorbs \(114\,\text{kJ}\) when \(2\) moles of \(\text{NO}_2\) are formed.
C
The reaction releases \(114\,\text{kJ}\) when \(2\) moles of \(\text{NO}_2\) are formed.
D
The enthalpy change becomes positive if the equation is balanced differently.
E
The reaction releases \(57\,\text{kJ}\) when \(1\) mole of \(\text{NO}_2\) is formed, but \(\Delta H^\circ\) must remain \(-114\,\text{kJ}\).
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