Question 42 - Chemical and Physical Foundations of Biological Systems Practice Test for the MCAT

If \(3.20\) g of \(NaNO_3\) are dissolved in enough water to make \(0.500\) L of solution, what is the molality of the solution? (Assume the density of the solution is \(1.00\) g/mL). \(\text{MM NaNO}_3 = 84.9947 \frac{\text{ g}}{\text{mol}}\) (See attachment.)

A chemical solution is a homogeneous mixture of one or more substances called “solutes” in another substance called “solvent”. The concentration of a solution is the amount of solute that is dissolved in a certain amount or solvent or solution.

There are different units to represent the concentration of a solution, among them there are the molarity (M), defined as the moles of solute present in \(1\) L of solution; molality, (m) defined as the moles of solute dissolved in \(1\) kg of solvent; and percentage by mass (%m), which represents the grams of solute dissolved in \(100\) g of solution.

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