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What if I2 and H2 began at the same concentration - then do we start at the same point? ... or is it acceptable to start at different concentrations...

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    $\begingroup$ The question probably won't start H2 and I2 at the same C so that it is easier to see the two lines. $\endgroup$ Commented Jul 24, 2014 at 15:56

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What if I2 and H2 began at the same concentration - then do we start at the same point?

Yes (and in textbook problems involving graphs this situation would be avoided for the reason pointed out in brinnb's comment)

is it acceptable to start at different concentrations...

Also yes. No law against it.

I'm guessing that the graphs are part of a textbook problem. Are you able to figure out which graph can occur?

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