To determine which glass had the faster reaction rate, we can consider the principles of surface area and concentration. The glass with the vitamin added in powder form (option b) would typically have a faster reaction rate compared to the glass with the vitamin added as a whole tablet (option a). This is because the powdered form has a greater surface area exposed to the reactants, which allows for a quicker reaction.
Therefore, the answer is:
b. The glass with the vitamin added in powder form.
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