Ok what do you guys think of this question? I may be approaching it wrong, or it may just be a case of strange rounding off, but the question is:
If KCl and 4.60g of O2 are obtianed from heating 42.00g of KClO3, what is the mass percent yield of O2?
a) 62.92
b) 55.93
c) 41.94
d) 17.01
e) 27.96...