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Severus Snape needs to know how much water is in a sample for his potions class. Calculate the percent of water in a sample if before dehydration the sample weighed 1.972 g, and 1.641 g after dehydration.

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meerkat18
To solve for the percent water in the sample, we follow the written formula below.

Percentage Water = (Wi - Wf)/Wi*100

Where: Wi = initial weight
             Wf = final weight

Given:

Wi = 1.972 g
Wf = 1.641 g

Required: Percentage Water in the Sample

Solution:

Percentage Water = (Wi - Wf)/Wi*100
Percentage Water = (1.972-1.641)/1.972*100
Percentage Water = 16.8%

ANSWER: 16.8%

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