During a lab, 1.62g of COCl2 · x H2O were heated. After heating, only 0.88g of COCl2 remained. Calculate the formula of the hydrate.
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You have to break down the cobalt chloride and water by finding the mass of each and using empirical formula.

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davedadonn12 davedadonn12 · Answer 1 · 2022-03-22T13:13:18+01:00

Answer:

Explanation:

Let the number of moles of water in the required formula be "y".

The final formula should be in the form of : CoCl2 yH2O

1.62 g is the weight of CoCl2 and water in the sample

After heating, the remaining mass represents the mass the salt only

mass of water in sample = 1.62 - 0.88 = 0.74 g

From the periodic table:

molar mass of cobalt is 59 g

molar mass of chlorine is 35.5

molar mass of hydrogen is 1

molar mass of oxygen is 16

molar mass of formula = 59 + 2(35.5) + 18y = 130 + 18y g

Now we have calculate the mass/molar mass for each part of the formula (salt and water) and equate them to get number of moles of water as follows:

0.88 / 130 = 0.74 / y18

y = 6.07 which is approximately 6 moles

Thus, the final formula is CoCl2 6H2O. This hydrate is called cobalt(II)chloride hexahydrate.

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