July 23, 2014

Homework Help: Chemistry

Posted by Katelyn on Sunday, October 20, 2013 at 11:43pm.

Hi, I'm doing a chem lab of the Percent Composition of Potassium Chlorate-A Gas Law Experiment and we need to calculate the percent of KClO3 in the sample volumetrically and gravimetrically. I need help calculating the Volumetric percent of KClO3 in sample given the information we know:
-Mass of glassware: 120.3340g
-Mass of glassware+sample (Before heat)= 122.3240g
-Mass of Glassware+sample (After heat)= 121.6070g
-Mass of beaker=299.60g
-Mass of Beaker+H2O=874.20g
-Density of water=0.99733g
-Volume of H2O Displaced=576.14mL
-Atmospheric Pressure=760.5mmHg
-Barometer Temperature=22.5*C
-Vapor Pressure of H2O=22.4 torr
-Temperature of O2 gas=24.0*C

I know how to calculate the percent of KClO3 gravimetrically but Im lost as to how to calculate it volumetrically using gas laws. We also need to calculate the theoretical percent of KClO3 in the sample which we need to calculate the percent error.

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