Question

The data shown was obtained by a student in order to determine the percent of water in a hydrate:

Mass of Hydrate = 5.0 grams
Mass of Anhydrous Compound = 3.0 grams
What is the percent of water in the hydrate?
a. 82%
b. 60%
C. 30%
d. 40%

Answer 1

Option-B (60%) is the correct answer.

Explanation:

To solve this problem first we will calculate the mass of hydrated compound as,

Hydrated Compound = Mass of Anhydrous Compound + Mass of Hydrate

Hydrated Compound = 3.0 g + 5.0 g

Hydrated Compound = 8.0 g

Secondly, we will apply following formula to find percent of water in hydrated compound,

%H₂O = Mass of H₂O / Mass of Hydrated Compound × 100

Putting values,

%H₂O = 5.0 g / 8.0 g × 100

%H₂O = 62.5 % ≈ 60%