I should point out here that since CaS is soluble in water that extenuation circumstances will be necessary (temperature, saturation points, etc) in order to produce a solid.
% yield = 100*(actual/theoretical)
85% = 100*(3.0/theoretical)
Theoretical = 3.0/0.85 = about 3.6 grams.
CaCl2 + Na2S ==> CaS + 2NaCl
So how much of each reagent is needed to make about 3.6g of CaS.
Aqueous sodium sulfide reacts with aqueous calcium chloride to make a solid. The % yield is 85%. Calculate the amount of each reactant needed to actually make 3.0g of the solid.
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