It says 8. In a similar experiment Mary Moreorlesss was to determine the loss of weight when a crucible of potassium chlorate was heated to drive off the oxygen. After finishing the experiment she concluded the potassium chlorate contained 24.0% oxygen. Why did miraculous(science teacher) give Mary a failing grade ?

Answer 1

%Oxygen = (3*16/molar mass KClO3*100 = ? about 39%