This is the correct method, because it produces a 300 ml solution with a concentration of 0.500M.
Work Step by Step
1. Find the concentration after the dilution: $C_1 * V_1 = C_2 * V_2$ $0.600*250= C_2 *300$ $150 = C_2 *300$ $C_2 =0.500M$
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