Question

Oxygen gas can be generated by the decomposition of potassium chlorate according to the following equation:
2 KClO3(s) --->2 KCl(s) + 3 O2(g)

Answer 1

Interesting but I don't see a question.

Answer 2

P atmosphere = P o2 + P h2o
hence P o2 = P atm- P h2o
we get Po2 = 737.6 mm
applying PV=NRT
PV=m/M RT
hence m = PVM/RT
we have to take pressure in atm, Volume in litre and temperature in kelvin

On further calculation we will get as mass in gram as 0.163gm