THe addition of strong electrolyte such as MgSO4 compound will led the equilibrium to shift due to common ion effect. The addition of common ion decrease the solubility as the reaction shift to the left thus less product is formed.
Carbohydrates! hope this helped!
So C12 is the limiting reactant and P4 is the excess
Mass P4 consumed= 0.31 mol X 123.9 g/mol =38.41 g P4 consumed.
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The answer is 1:1 for this question