Question

(Part A)

Calculate the volume of CO₂ at 11.6°C and 746 mmHg pressure obtained by treating 22.0 g of Na₂CO₃ with an excess of hydrochloric acid.

(Part B)

With the Hall process, how many hours will it take to deposit 664 g of Al at a current of 31.0 A?

(Part C)

A 0.450−g sample of steel contains manganese as an impurity. The sample is dissolved in acidic solution and the manganese is oxidized to the permanganate ion MnO₄⁻. The MnO₄⁻ ion is reduced to Mn²⁺ by reacting with 50 mL of 0.0800 M FeSO₄ solution. The excess Fe²⁺ ions are then oxidized to Fe³⁺ by 22.1 mL of 0.0100 M K₂Cr₂O₇. Calculate the percent by mass of manganese in the sample.

(Part D)

A sample of 10.00 g of sodium reacts with oxygen to form 14.38 g of sodium oxide (Na₂O) and sodium peroxide (Na₂O₂).Calculate the percent composition of the mixture for (Na₂O) and (Na₂O₂).

Answer 1