Question

If you started with 4.994 g of impure solid and isolated 3.915 g of recrystallized solid, what is your percent recovery?

a) 78.5%
b) 20.6%
c) 64.2%
d) 54.5%

Answer 1

The percent recovery of a recrystallized solid is calculated by dividing the mass of recrystallized solid by the mass of the impure starting solid and multiplying by 100. In this case, the percent recovery is (3.915 g / 4.994 g) × 100, which equals 78.4%, and the correct answer is a) 78.5% after rounding.

Step-by-step explanation:

To calculate the percent recovery of a recrystallized solid, you divide the mass of the recrystallized solid by the mass of the impure solid you started with and then multiply by 100 to convert it into a percentage. In this case:

• Mass of impure solid: 4.994 g
• Mass of recrystallized solid: 3.915 g

The formula for percent recovery is:

Percent Recovery = (Mass of Recrystallized Solid / Mass of Impure Solid) × 100

Let's plug in our values:

Percent Recovery = (3.915 g / 4.994 g) × 100 = 78.4%

Therefore, the correct answer to the question is a) 78.5%, which is rounded up from 78.4%.