Question

A chemistry student needs 95.00 g of heptane for an experiment. He has available 0.50 kg of a 34.4% w/w solution of heptane in benzene Calculate the mass of solution the student should use. If there's not enough solution, press the "Ne solution" button.

Round your answer to 3 significant digits.

Answer 1

To obtain 95.00 g of heptane from a 34.4% w/w heptane-benzene solution, the student needs to use 276.163 g of the solution, which is available since the student has 0.50 kg of the solution.

Step-by-step explanation:

The student is asking how much of a 34.4% w/w solution of heptane in benzene they will need to use to obtain 95.00 g of heptane for their experiment. First, we need to calculate the total amount of heptane in the available solution. Since the solution is 34.4% w/w, this means that in every 100 g of solution, there are 34.4 g of heptane.

To find out how much of the solution is needed for 95 g of heptane, we use the formula:

Mass of solution = (Desired mass of heptane) / (Percentage of heptane in solution as a decimal)

Mass of solution = 95.00 g / 0.344 = 276.163 g

Since the student has 0.50 kg (or 500 g) of the solution, there is enough to obtain the required 95.00 g of heptane. Therefore, the student should measure out 276.163 g of the solution.