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Stoichiometry

Q1: Pick out the wrong statement.

A To make 100 kg of a solution containing 40% salt by mixing solution A (containing 25% salt) and solution B (containing 50% salt), the amount of solution A required is 40 kg.

B 1.2 gm atoms of carbon and 1.5 gm moles of oxygen are reacted to give 1 gm mole of carbon dioxide. The limiting reactant is carbon. The percent excess reactant supplied is 25.

C A gas bubble at a pressure of Pg is passed through a solvent with a saturation vapour pressure of Ps. If the time of passage of the bubble is long and air is insoluble in the solvent, the mole fraction of solvent in the bubble will be equal to Ps/Pg.

D A supersaturated solution of a sparingly soluble solute, at a concentration of C, is being fed to a crystalliser at a volumetric flow rate of V. The solubility .of the solute is C1. The output rate of solids from an efficient crystalliser is (C + C1) V.

ANS:D - A supersaturated solution of a sparingly soluble solute, at a concentration of C, is being fed to a crystalliser at a volumetric flow rate of V. The solubility .of the solute is C1. The output rate of solids from an efficient crystalliser is (C + C1) V.

The wrong statement is: "A supersaturated solution of a sparingly soluble solute, at a concentration of C, is being fed to a crystalliser at a volumetric flow rate of V. The solubility of the solute is C1. The output rate of solids from an efficient crystalliser is (C + C1) V." In an efficient crystallizer, the output rate of solids would typically be proportional to the difference between the solubility of the solute (C1) and the concentration of the solution being fed (C), rather than the sum. So, the correct expression for the output rate of solids would be (𝐶1−𝐶)×𝑉(C1−C)×V. Therefore, the statement is incorrect.



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