The collision between reactants is most likely to produce a reaction at point: c or b

The reaction is the high point in the graph, so b

it will likely produce a reaction at point b because it is a higher point on the graph. If you look a point C you can see that its location is at the end of the reaction progress when the products have been made so choice B makes the most sense. Also regard the high activation energy at point B, which shows that a reaction has just progressed.

1.75 is the weight of one medium egg

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