## 4.17E

JamieVu_2C
Posts: 108
Joined: Thu Jul 25, 2019 12:16 am

### 4.17E

A technician carries out the reaction $2SO_{2}(g) + O_{2}(g) \rightarrow 2SO_{3}(g)$ at $25^{o}C$ and 1.00 atm in a cylinder fitted with a piston and maintained at constant pressure. Initially, 0.030 mol SO_{2} and 0.030 mol O_{2} are present in the cylinder. The technician then adds a catalyst to initiate the reaction. (e) How much enthalpy is exchanged, and does it leave or enter the system?

The reaction enthalpy is -197.kJ. Why do you have to divide this value by 2 mol SO2 and then multiply it by .030 mol SO2? Also, how do you know to use the moles of SO2 instead of the moles of O2?

Jacob Puchalski 1G
Posts: 97
Joined: Fri Aug 09, 2019 12:16 am

### Re: 4.17E

Since they give you the specific amount of moles then you're able to find the specific reaction enthalpy.

Return to “Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)”

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