Question

A mixture of two compounds, A and B, was separated by extraction. After the compounds were dried, their masses were found to be: 119 mg of compound A and 97 mg of compound B. Both compounds were recrystallized and weighed again. After recrystallization, the mass of compound A was 83 mg and the mass of compound B was 79 mg. Calculate the percent recovery from recrystallization for both compounds.

Answer 1

The percent recovery from re crystallization for both compounds A and B is 69.745 and 81.44 % respectively.

Step-by-step explanation:

Mass of compound A in a mixture = 119 mg

Mass of compound A after re-crystallization = 83 mg

Percent recovery from re-crystallization :

`\frac{\text{Mass after re-crystallization}}{\text{Mass before re-crystallization}}* 100`

Percent recovery of compound A:

`(83 mg)/(119 mg)* 100=69.74\%`

Mass of compound B in a mixture = 97 mg

Mass of compound B after re-crystallization = 79 mg

Percent recovery of compound B:

`(79 mg)/(97 mg)* 100=81.44\%`