Chemistry Help?

1) Calculate the molarity of a solution prepared by dissolving 12.5 g of Na2CrO4 in enough water to produce a solution with a volume of 830. mL

2)How many moles of KBr are present in 170. mL of a 0.119 M solution?

3) How many milliliters of 7.0 M HCl solution are needed to obtain 0.20 mol of HCl?
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