Question

A chemistry student needs 35.0 g of thiophene for an experiment. She has available 1.0 kg of a 14.0\%w/w solution of thiophene in ethanol Calculate the mass of solution the student should use. If there's not enough solution, press the "solution" button. Be sure your answer has the correct number of significant digits.

Answer 1

• The student should use 250g of the 14.0% w/w solution of thiophene in ethanol

Step-by-step explanation:

You must find how many grams of a 14.0% solution contains 35.0 g of thiophene (solute) and then evaluate if the amount available (1.0 kg) is enough.

Formula:

• % w/w = (mass of solute / mass of solution) × 100

Substitute and solve for the mass of solution:

`14.0 =(35.0g/x)* 100\\\\14.0/100=35.0g/x\\\\x=35.0g*100/14\\\\x=250g`

Hence, the student should use 250g of the 14.0% w/w solution of thiophene in ethanol. Since, 1.0 kg is 1,000g there is enough available.