We’re being asked to calculate the molarity (M) of glycerol (C3H8O3) in a solution. Recall that molarity is the ratio of the moles of solute and the volume of solution (in liters). In other words:
We first need to determine the number of moles of C3H8O3. Assuming that we have 100 g of solution, this means we have 50 g of C3H8O3 and 50 g H2O.
To find the moles of C3H8O3, we’ll need its molar mass. The molar mass of C3H8O3 is:
C3H8O3 3 C × 12 g/mol C = 36 g/mol
8 H × 1 g/mol H = 8 g/mol
3 O × 61 g/mol O = 48 g/mol
Sum = 92 g/mol
A solution containing equal masses of glycerol (C3H8O3) and water has a density of 1.10 g/mL. Calculate the molarity of glycerol in the solution.
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