A 10.00g sample of a substance is found to contain 5.12g of water.What is the percent by mass of water in the compound?
A)5.12%
B)4.88%
C)48.8%
D)51.2%

Question

Quizplus · Accepted Answer

First, we need to determine the mass of the substance without water.

Mass of substance = total mass - mass of water

Mass of substance = 10.00g - 5.12g

Mass of substance = 4.88g

Next, we can calculate the percent by mass of water using the following equation:

Percent by mass = (mass of water / total mass) x 100%

Percent by mass = (5.12g / 10.00g) x 100%

Percent by mass = 51.2%

Therefore, the answer is (D) 51.2%.

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