1. The problem statement, all variables and given/known data Consider a mixture of potassium chloride and potassium nitrate that is 43.2% potassium by mass. What is the percent KCl by mass of the original mixture? 2. Relevant equations 3. The attempt at a solution x is the mole of KCI in the mixture y is the mole of KNO3 in the mixture molar mass of KCl is 74,5g/mol molar mass of KNO3 is 101g/mol So, 74,5x+101y=100 Also, K %mass in KCl is 39/74,5=0,5235 and K %mass in KNO3 is 39/101=0,386 So, 0,5235x+0,386y=0,432 2 unknown, 2 equations: x Solved=0,217 ...that is: 0,217x74,5=16,16gr KCl; that's %16,16 in a sample 100gr But solution manual says it's %32.9KCl What's wrong with my calculation?