A mixture of KCl and KNO₃ is 44.20% potassium by mass.The percentage of KCl in the mixture is closest to A)40% B)50% C)60% D)70% E)80%

Question

Quizplus · Accepted Answer

The molar mass of KCl is 74.55 g/mol, and the molar mass of KNO3 is 101.10 g/mol. Let x be the mass fraction of KCl in the mixture. Then, the mass fraction of KNO3 in the mixture is (1-x). The mass fraction of potassium in the mixture is 0.4420. Therefore, we have the following equation:0.4420 = (39.10x + 39.10(1-x)) / (74.55x + 101.10(1-x))Solving for x, we get x = 0.598. Therefore, the percentage of KCl in the mixture is closest to 59.8%, which is closest to choice A.

A Mixture of KCl and KNO3 Is 44

A Mixture of KCl and KNO₃ Is 44