We’re being asked to determine the mass of NH3 needed to be dissolved in 475 g methanol to make a 0.250 m solution.
Recall that molality is the ratio of the moles of solute and the mass of solvent (in kilograms).
In other words:
What mass (in g) of NH3 must be dissolved in 475 g of methanol to make a 0.250 m solution?
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