CCl4, an important commercial solvent, is prepared by the reaction of Cl2(g) with a carbon compound. Determine

Question

CCl4, an important commercial solvent, is prepared by the reaction of Cl2(g) with a carbon compound. Determine H° for the following reaction.
CS2(l) + 3 Cl2(g) CCl4(l) + S2Cl2(l)

Use appropriate data from the following listing.


CS2(l) + 3 O2(g) CO2(g) + 2 SO2(g) H° = -1077 kJ
2 S(s) + Cl2(g) S2Cl2(l) H° = -58.2 kJ
C(s) + 2 Cl2(g) CCl4(l) H° = -135.4 kJ
S(s) + O2(g) SO2(g) H° = -296.8 kJ
SO2(g) + Cl2(g) So2Cl2(l) H° = +97.3 kJ
C(s) + O2(g) CO2(g) H° = -393.5 kJ
CCl4(l) + O2(g) COCl2(g) + Cl2O(g) H° = -5.2 kJ

Answer 1

I like this kind of problem, because it is just a puzzle that you know must have an answer...The idea is to combine any of the equations given so that when you add them up everything cancels and leaves you with just the equation you are looking for. Remember that if you need to use two of some equation, you multiply its DH by 2, and that if you reverse an equation, you change the sign on its DH.

So, if you take the first equation as it is written, that puts the right reactant on the left side. Next take the second equation since that gives you the correct product on the right. Next, add the 3rd equation to give you the CCl4 product on the right. The rest of the steps will let you get rid of everything else. Use the C+O2 equation backwards to get rid of the CO2 on the right of the first equation, and take 2 X the reverse of the S + O2 equation to get rid of the 2 SO2 in the first equation.

When you add up all the equations, you should be left with the equation you're trying to find. Then, add the delta H values, and you're done.

Answer 2

Carbon tetrachloride, also known by other names is the chemical compound CCl4. It is widely used in synthetic chemistry and formerly widely used in fire extinguishers and refrigeration, but largely abandoned. At room temperature and pressure, it is a colorless liquid with a "sweet" smell that can be detected at low levels.

Answer 3

-283.5kJ