What mass in g of nh3must be dissolved in 475 g of methanol to make a 0.250 m molality solution

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In: Chemistry

1)    What mass (in g) of NH3must be dissolved in 475 g of methanol to make a 0.250 m solution?

2)    How many moles of KF are contained in 244 mL of 0.135 m KF solution?  The density of the solution is 1.22 g/mL

3)    Commercial grade HCl solutions are typically 39.0% (by mass) HCl in water.  Determine the molarity of the HCl, if the solution has a density of 1.20 g/mL.

4)    A solution is prepared by dissolving 49.3 g of KBr in enough water to form 473 mL of solution.  Calculate the mass % of KBr in the solution if the density is 1.12 g/mL.

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