Lets cancel anything that is in common.

I need 4 moles.

In this reaction the Delta H is a-.7 that is entropy change that is the heat given off.Since I'm using the reaction exactly as I sex iran skjult see it I we use the Delta G exactly as it's given.Lets look at this reaction.The chlorines won't cancel because they're on the same side the equation and that will leave me with CH_4 gas plus 4 Cl_2 gas yielding CCl_4 gas plus 4 HCl gas.So lets go through and look at this equation first its standards state conditions.You had previously learned that Delta G is equal to delta H minus T delta S, but here we learned about Delta G formations and use them and sum them up to come up with the Delta G of a reaction.We also did a stepwise process where we added equations together to get the Delta G other overall reaction.

Nothing else is cancelled.

Now the definition is very similar to the Delta.I have carbon solid in the form of graphite that gets cancelled.That will give me a Delta G for this reaction 2 times the size the Delta G the reaction that was up there.Because this definition if you have a stable element to make that element from itself doesn't require any energy so the Delta G of formation of any element is equal.So now we have that equation and we can use that equation to calculate the Delta g of a reaction.A very very similar process but we're going to see it played out here with Delta.Carbon in the form of graphite plus 2 Cl_2 gas produces CCl_4 gas.So I have got to have a positive Delta S of the surroundings.It has to be greater than.If you did not obtain that value for the Delta G the reaction go back and look did you incorporate the coefficient of 2 here?