The thermometer was removed and the crucible and its contents reweighed.
a) Mass of crucible with manganese(IV) dioxide =53.300g
b) Mass of crucible after potassium chlorate was
c) Mass of crucible after heating =61.94g
d) Mass of potassium chloride = mass of crucible before heating - mass of crucible after heating
e) Mass of oxygen in sample of potassium chlorate =
Mass of potassium chlorate - mass of potassium
chloride = 20 - 8.64 =11.36g