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KCLO3(s) + MnO2 (acts as catalyst) combined in test tube connected to the apparatus and heated to produce KCl(s) + O2(g)-apparatus initially filled with water, so oxygen gas will displace the water ~heat removed and, after it cools, displaced water measured-R = PV/nT ~n = moles of O2 produced from reaction = mass loss of sample in test tube x mol/31.998 g ~T = temperature of the room ~V = volume displaced from the flask (after apparatus cools down) = mass of H2O / density of H2O (from table at given T) ~P = pressure of O2 gas at T ~when siphon is balanced, P_flask = P_atm, and P_flask = P_O2 + P_H2Ovapor = P_atm ~thus, P_O2 = P_atm (from barometer, w/ abs error +- .1 torr) - P_H2Ovapor (from table at given T)

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