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Question

The ammonia prepared by treating ammonium sulphate with calcium hydroxide is completely used by NiCl2.6H2O to form a stable coordination compound. Assume that both the reactions are 100% complete. If 1584 g of ammonium sulphate and 952 g of NiCl2.6H2O are used in the preparation, the combined weight (in grams) of gypsum and the nickel-ammonia coordination compound thus produced is .
(Atomic weights in g mol1 : H = 1, N = 14, O = 16, S = 32, Cl = 35.5, Ca = 40, Ni = 59)

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Solution

molesCa(OH)2+12(NH4)2SO41584132=122NH3+24CaSO4.2H2O(Gypsum)
Weight of gypsum formed =12×172=2064g
molesNiCl2.6H2O+952238=46NH324[Ni(NH3)6]Cl2246=4
Mass of [Ni(NH3)6]Cl2 formed=4×232=928g
Total weight =2064 + 928 = 2992 g.

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