Answer: 0.9M
Explanation: C1V1 = C2V2
C1 = 2M
V1 = 450mL
V2 = 1000mL
C2 =?
C1V1 = C2V2
2 x 450 = C2 x 1000
C2 = 900/1000
C2 = 0.9M
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