# Lab+04+Data+-Martinez.pdf - Name_​Jessica Martinez​ CHM...

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Name __ Jessica Martinez _____ CHM 151-190 Lab 4: The Law of Definite Proportions For calculation-based problems, you must show your work for full credit. Data Trial 1 Trial 2 Trial 3 a) Initial mass of crucible & MnO 2 (g) __ 88.100 88.100 88.100 b) Initial mass of crucible, MnO 2 , & KClO 3 (g) _ 108.100 _ _ 113.100 118.000 c) Mass of KClO 3 (g) 20g 25g 30g d) Mass of crucible and contents after heating (g) _ 100.267 103.308 106.350 e) Mass of oxygen lost during heating (g) 7.833 f) Mass of KCl (g) 74.5513 g) Experimental mass percent of oxygen in KClO 3 39.166% h) Average mass percent Using your data from Trial 1, show your work for each of the following: Mass of oxygen lost during heating 108.100g-100.267=7.833 of lost oxygen during heating. The experimental mass percent of oxygen in KClO 3 K=39.098 Cl=35.45 O=15.999 * 3=47.977 39.098+35.45+47.997=122.545 47.997/122.545*100=39.166%

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Questions 1. Write a balanced chemical equation for the reaction that occurred. MnO2 1. 2 KClO3(s) 2 KCl(s) + 3 O2(g) 2. Calculate the theoretical percent composition (i.e., as discussed in lecture) of oxygen in potassium chlorate.
• Fall '19
• Chemistry, Chemical reaction, potassium chlorate

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