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Enthalpy Practice Test

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Q1

Consider the following processes:

$A \rightarrow 2B + C + \Delta $H_{1}$$

$D\rightarrow B + C + \Delta $H_{2}$$

$D \rightarrow 2E + \Delta $H_{3}$$

Which for the following expresses $\Delta H$ for the process $A + C \rightarrow 4E$ ?

The formation of nitrous oxide is a 2-step process.

![](https://vt-vtwa-assets.varsitytutors.com/vt-vtwa/uploads/formula_image/image/86027/gif.latex $"N_{2}$ + $O_{2}$ \rightarrow 2NO (step 1)")

$2NO + $O_{2}$ \rightarrow $2NO_{2}$ (step 2)$

![](https://vt-vtwa-assets.varsitytutors.com/vt-vtwa/uploads/formula_image/image/86028/gif.latex $"N_{2}$ + $2O_{2}$ \rightarrow $2NO_{2}$ (overall reaction)")

The overall enthalpy of the reaction is +68kJ.

If the enthalpy change of step 1 is 180kJ, what is the enthalpy change of step 2?

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