What is the molarity of an aqueous solution that lis 6.75% gucose (C6H12O6) by mass? (Assume a density of 1.03 g/ mL for the solution.)
In this problem our goal is to know the molarity of a solution of glucose.
Molarity expresses the concentration of a solution as the number of mole in one liter of solution:
The only way to know how many moles of glucose are contained in 1 liter of solution is knowing first the mass of glucose contained in the same quantity of solution. Then we will divide the mass of glucose for its molecular weight to find the moles.
But how can we find the mass of glucose in one liter of solution.
The text gives us a concentration but it is by mass, so we must use the density of the solution to know the mass of one liter of solution.
Then you just need to follow the previous instructions to solve the problem.