A hydrate of CoCl2 has a mass of 15.80 g before heating. After heating, the mass of the anhydrous compound is found to be 9.32 g.

Explain how you would determine the formula of the hydrate and then write out the full name of the hydrate.

Question

Chemistry

Deegan Greene

12 October, 16:47

A hydrate of CoCl2 has a mass of 15.80 g before heating. After heating, the mass of the anhydrous compound is found to be 9.32 g.

Explain how you would determine the formula of the hydrate and then write out the full name of the hydrate.

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Answers (1)

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Steve Atkinson · Answer 1

Let's suppose the formula is

CoC l2. n H2 O

CoC l2. n H2 O-> CoCl2 + nH2O

H2O has the mss = 15.8-9.32 = 6.48g

H2O contains moles = 6.48 / (1.0x2+16.0) = 0.36

Moles in CoCl2 = 9.32 / (58.9+35.5x2) = 0.071747

n = 0.36/0.071747

= 5

A hydrate of CoCl2 has a mass of 15.80 g before heating. After heating, the mass of the anhydrous compound is found to be 9.32 g.Explain how you would determine the formula of the hydrate and then write out the full name of the hydrate.

A hydrate of CoCl2 has a mass of 15.80 g before heating. After heating, the mass of the anhydrous compound is found to be 9.32 g.

Explain how you would determine the formula of the hydrate and then write out the full name of the hydrate.