He took 400 ml of the solution then diluted it with water


A student dissolved 3.00 g of Co(NO3)in enough water to make 100.00 mL of stock solution. He took 4.00 mL of the solution then diluted it with water to give 275 mL of a final solution. How many moles of NO3-1 are there in the final solution?

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Physics: He took 400 ml of the solution then diluted it with water
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