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# chemistry free enrgy change

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Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
1. couls someone explain how the gradient of the graph of delta g against t is equal to delta s ?? i dont get why delta h disappears from the equation ?
thanks !!
2. (Original post by HG1)
couls someone explain how the gradient of the graph of delta g against t is equal to delta s ?? i dont get why delta h disappears from the equation ?
thanks !!

There is the equation. A linear graph is usually of the form y = mx + c (where the c represents the y intercept (where x = 0), m is the gradient, x is the thing on the x axis and y the y axis).

The thing above looks slightly different - it is y = c + mx where m = - delta s. The c (delta h) is not part of the gradient term so it disappears - the gradient of a straight line is just the thing that is next to the 'x'.
3. (Original post by SeanFM)

There is the equation. A linear graph is usually of the form y = mx + c (where the c represents the y intercept (where x = 0), m is the gradient, x is the thing on the x axis and y the y axis).

The thing above looks slightly different - it is y = c + mx where m = - delta s. The c (delta h) is not part of the gradient term so it disappears - the gradient of a straight line is just the thing that is next to the 'x'.
Thanks for the reply its helping , could you show the gibbs equation is written out in terms of y=mc+c ??
4. (Original post by HG1)
Thanks for the reply its helping , could you show the gibbs equation is written out in terms of y=mc+c ??
I did so in my post just to repeat - if a line is given by the equation y = mx + c, then m is the gradient.

The equation is of the form y = mx + c, where y = delta G, c = delta H, x = T and m = delta S. If you want it to look exactly like y = mx+c then you just rearrange it so that delta G = -delta S * T + delta H.

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