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# Problem: Find the percent of KCl if a mixture of KCl and KNO3 is 44.2% potassium by mass.A. 12% B. 8% C. 20% D. 33% E. 40%

###### FREE Expert Solution

Determine the percent KCl in the mixture of KCl and KNO3 with 44.2% potassium by mass.

Step 1. Find the molar mass of KCl and KNO3

Step 2. Assume that we have 44.2 g K, find the moles of K

Step 3. Establish a two unknown equation and find the mass % of KCl

Step 1. Find the molar mass of KCl and KNO3

KCl             1 K × 39.10 g/mol K = 39.10 g/mol
1 Cl × 35.45 g/mol Cl = 35.45 g/mol
Sum = 74.55 g/mol

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###### Problem Details

Find the percent of KCl if a mixture of KCl and KNO3 is 44.2% potassium by mass.

A. 12%

B. 8%

C. 20%

D. 33%

E. 40%

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Based on our data, we think this problem is relevant for Professor Lunsford's class at PDX.