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At this point, you have measured
or can easily calculate
the following


A. Mass of UNKNOWN used
Mass of GAS generated
C. Mass of WATER displaced by gas
D. Pressure of Gas collected
E. Temperature of gas

A and B are used to determine the %  KClO3 in the UNKNOWN
The relationship of  mass of gas generated to mass of KClO3 present is given by
2 KClO3 ---------> 2 KCl + 3 O2
B, C, D and E are used to calculate the Molar Volume at STP
C is converted to Volume using the density of water
D must be corrected for the vapor pressure of water
E and the corrected D are used to convert the Volume calculated from C to Volume at STP



RWK 1997