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Answer:
3.63 M
Explanation:
M1 = 12M
V1 = 6.5 L
V2 = 15 + 6.5 = 21.5 L
Number of moles does not change so M1V1 = M2V2
M2 = M1V1/V2 = 12 x 6.5/21.5 = 3.63 M