O In a certain chemical reaction, substance A is transformed into product P. The mass of A at any given time, t, is m, and the rate of transformation of A at time t is proportional to m. Given that the original mass of A is 150g, and that 30g has been transformed after 125 seconds: (a) Form and solve the differential equation relating m to t. (c) Sketch a graph of me versus t. (b) Find the mass of A transformed over a 300s period.

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