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Now, I am to graph another one for the case of a gas which decompose on heating, N2O4, giving 2 moles of NO2. I can't seem to imagine such a situation.
What I've come up till now is that upon heating, decomposition occurs, hence and increase in pressure at first. However, heat will certainly be absorbed in the decomposition process. If so, there would be a sudden sharp increase in pressure and then, the gradient of the graph decreases to become once more linear. Am I right? I'll reply in about 30 min. (have other work to do... )
If NO2 and N2O4 are considered ideal gases (they probably aren't), you are increasing T, and at the rate of decomposition, increasing n. V is constant so P will increase.