How to Calculate Mass Percent Mass Percent Compostion of a Compound ... Print Potassium ferricyanide is made up of potassium, iron, carbon and nitrogen. Calculate the molar mass of KClO3 in grams per mole or search for a chemical formula or substance. In figuring the mass percent of oxygen in potassium chlorate? Chemistry question help? ... mass of 3.78g of potassium chloride remained after 7.62g of potassium chlorate decomposed. % Composition By Mass of Oxygen in Potassium Chlorate Objective: The purpose of this lab was to calculate the percent composition by mass of oxygen in potassium chlorate. The molar mass and molecular weight of KClO3 - Potassium Chlorate is 122.5495. How do I calculate the mass percent in the original mixture? Mass of potassium chlorate. The chemical equation $$\ce{2KClO3 -> 3O2 + 2KCl}\tag7$$ indicates that $2\ \mathrm{mol}$ of potassium chlorate yield $3\ \mathrm{mol}$ of oxygen. Therefore, $$n_{\ce{KClO3}}=\frac23\cdot n_{\ce{O2}}\tag8$$ The molar mass of potassium chlorate is $M_{\ce{KClO3}}=122.55\ \mathrm{g\ mol^{-1}}$. First calculate the molar mass of the potassium chlorate KClO3 K is 39.1, Cl is 35.45 and O is 16 x 3 =48 The molar mass for one mol is 122.55g/mol The percent composition is the part the oxygen contributed divided by the total molar mass times 100(to convert a decimal to a percent) 48/122.55 x 100 is 39.167% Potassium Chlorate is 39.167 Experimental % oxygen = Mass of oxygen lost x 100 Mass of KClO 3. The theoretical value of the % oxygen in potassium chlorate is calculated from the formula KClO 3 with a molar mass = 122.6 g/mol. Frequently it is interesting and instructive - to determine the percent error of an experimental determination. Calculate the percent of oxygen in potassium chlorate. ... Mass of potassium chlorate (#2-#1) A 0.428-gram sample of a mixture of the solids, KCl and KClO3, is heated. If 80.7 mL of oxygen gas is collected over water at 18.0 oC and 100.8 kPa, calculate the mass percentage of KClO3 in the mixture. (PH2O at 18.0 oC = 15.5 torr Chemistry One way to generate oxygen is to heat potassium chlorate, KCLO3 (the other product is First calculate the molar mass of the potassium chlorate. KClO3 K is 39.1, Cl is 35.45 and O is 16 x 3 =48. The molar mass for one mol is 122.55g/mol. The percent composition is the part the oxygen contributed divided by the total molar mass times 100(to convert a decimal to a percent) 48/122.55 x 100 is 39.167%. Thus, the theoretical mass percent of oxygen. in potassium chlorate would be calculated using the expression: Mass Percent of Oxygen (theoretical) = 3 (Molar Mass of O) Molar Mass of KClO3 x 100 Students can therefore evaluate their accuracy in this experiment by comparing their experimental. 33 PERCENT POTASSIUM CHLORATE IN A MIXTURE Potassium chlorate (KClO3) decomposes on heating to produce potassium chloride and oxygen. What is the percentage of oxygen in KClO3? ... mass and multiply it by 100 to get a percent. Calculate and record the following for the experiment performed with 10.000 g KClO3 1. O2 generated by the decomposition of KClO3 is collected over water. The volume of oxygen collected at 24C at 762mmHg is 128ml. View Notes - Chemistry-Solution from CHEMISTRY AP Chemist at Bethlehem Catholic High School. CHAPTER 1 CHEMISTRY: THE Study Chemistry 166 Chemistry and Chemical Reactivity 8th Edition.pdf notes from Kristen T. International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research .. Search metadata Search full text of books Search TV captions Search archived web sites Advanced Search