Answer the following questions using information obtained from lecture, the text

Question

Answer the following questions using information obtained from lecture, the textbook, or lab manual. The responses will be collected at the beginning of recitation and checked at the start of your lab section for credit. Failure to complete all answers may result in exclusion from participating in the lab. A student heated a 4.901 g sample of a hydrated iron chloride. After heating, the anhydrous iron chloride had a mass of 3.010 g. Calculate the percentage by mass of water in the hydrated compound.

Explanation / Answer

Given

mass of hydrated sample = Sample + Water = 4.901 g

mass of anhydrous sample g

there fore mass of water present = 4.901 - 3.01 = 1.891 g

therefore

percentage by mass of water in the hydrated compound = (1.891 g / 4.901g) * 100 = 38.58%

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