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In a chemical reaction, the rate at which the amount of a reactant changes with time is proportional to the amount present, such that dy/dx=-0.7y,

In a chemical reaction, the rate at which the amount of a reactant changes with time is proportional to the amount present, such that dy/dx=-0.7y, when t is measured in hours. If there are 78g of reactant present when t=0, how many grams will be left after 4 hours? Give your answer to the nearest tenth of a gram.

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