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Question

250 mL of a Na2CO3 solution contains 2.65 g of Na2CO3. 10 mL of this solution is added to x mL of water to obtain 0.001 M Na2CO3 solution. The value of x is ______.
(Molecular mass of Na2CO3=106amu)

A
1000
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B
990
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C
9990
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D
90
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