A mass of 14.22g of (NH4)2SO4 (molar mass = 132.06g/mol) is dissolved in water. After the solution...

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(NH4)2SO4 + Al2(SO4)3â€¢18H2O --------> (NH4)2SO4.Al2(SO4)3.18H2O

no of moles of (NH4)2SO4Â Â = w/G.M.Wt

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 14.22/132.06 = 0.1076 moles

no of moles of Al2(SO4)3â€¢18H2O = W/G.M.Wt

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 30.19/666.36Â Â =0.0453 moles

from the balanced equation 1 mole of (NH4)2SO4 react with 1 moles of Al2(SO4)3â€¢18H2O

limiting reagent is Al2(SO4)3â€¢18H2O

1 mole of Al2(SO4)3â€¢18H2O react with (NH4)2SO4 to form 1 mole of (NH4)2SO4.Al2(SO4)3.18H2O

0.0453 moles of Al2(SO4)3â€¢18H2O react with (NH4)2SO4 to form 0.0453 mole of (NH4)2SO4.Al2(SO4)3.18H2O

mass of (NH4)2SO4.Al2(SO4)3.18H2O = no of moles * molar mass

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 0.0453*798.42 = 36.16 gm

the theoretical yield of the resulting alum is 36.16 gm

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