The ammonia prepared by treating ammonium sulphate with calcium hydroxide is completely used by ${\text{NiCl}}_2.6H_{2}O$ to form a stable coordination compound. Assume that both the reactions are $100\%$ complete. If 1584 g of ammonium sulphate and 952 g of ${\text{NiCl}}_2.6H_{2}O$ 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${\text{mol}}^{-1}$ : H = 1, N = 14, O = 16, S = 32, Cl = 35.5, Ca = 40, Ni = 59)

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