A student calculated the percent by mass of water in a hydrate as 14.2%. A hydrate is a compound that contains water as part of its crystal structure. If the accepted value is 14.7%, the student's percent error was

3.40%

Explanation:

Given dа ta:

Theoretical % of water = 14.2

Actual or accepted % of water = 14.7

Percent error = ?

Solution:

Formula:

(Actual% - theoretical% / actual%) * 100

(14.7 - 14.2 / 14.7) * 100

(0.5/14.7) * 100

0.034 * 100

3.40%