What mass of water is contained in 10.0 moles of the hydrated compound cobalt(II

Question

What mass of water is contained in 10.0 moles of the hydrated compound cobalt(II) chloride hexahydrate? Show calculations. A hydrate with a mass of 0.900g was heated and the residue was found to have a mass of 0.720g. (Show calculation for each part) (a) What mass of water was lost? (b) How many moles of water were lost? (c) If the molar mass of the anhydrous compound (i.e. the residue) is 288 g, how many moles of the anhydrous compound were there? (d) What is the ratio of moles of water to moles of anhydrous compound?

Explanation / Answer

2) One mole of CuCl3.6H2O (copper(III)Chloride hexahydrate) contains 6 moles of water

Hence, 10 moles of CuCl3.6H2O contains (10 x 6 = ) 60 moles of water.

Molar mass of water = 18 gm/mole i.e.- 1 mole of water weighs 18 gm

Hence, 60 mole of water weighs 60 x 18 = 1080gm

Answer- 10 mole of CuCl3.6H2O (copper(III)Chloride hexahydrate) contains 1080gm of water

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