Question

A chemistry student needs of heptane for an experiment. He has available of a w/w solution of heptane in chloroform. Calculate the mass of solution the student should use. If there's not enough solution, press the "No solution" button. Round your answer to significant digits.

Answer 1

The question is incomplete, here is the complete question:

A chemistry student needs 65.0 g heptane for an experiment. He has available 20.0 g of a 38.1% w/w solution of heptane in chloroform.

Calculate the mass of solution the student should use. If there's not enough solution, press the "No solution" button.  Round your answer to 3 significant digits.

Answer: The solution is not enough, "No Solution"

Explanation:

We are given:

Mass of solution needed = 20.0 g

Mass of heptane given = 65.0 g

38.1 % (w/w) solution of heptane

This means that 38.1 grams of heptane is present in 100 grams of solution

To calculate the amount of solution needed, we apply unitary method:

If 38.1 grams of heptane is present in 100 g of solution

So, 65.0 grams of heptane will be present in = $\frac{100}{38.1}\times 65.0=170.6g$ of solution

As, the given amount of solution is less than the required solution. So, there is not enough solution

Hence, the solution is not enough, "No Solution"