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5 \ Z. tot tota\ waged, wn ‘| ” VV Name ' t. \ Pd Date Percent Composition by Mass Worksheet Show all work, including the correct units and sig figs with your answer. Experimental Percent Composition by Mass 1. Achemist determines that 1.26 g of iron reacts with 0.54 g of oxygen to form rust. What Is the percent composition of each element in the new compound? LQgeOS871 35 2 ius Jor, Fa Peg FO 2. Inthe fab, a chemist analyzed a sample of methanol and found that it was made of 6.2 g of carbon, 4.1 g of hydrogen, and 15.9 g of oxygen. What is the percent composition of each element? 15.4 . Le.d 3. inan experiment, a student took a 12.2 g sample of table sale and chemically separated the chlorine from the sodium. He determined that there were 5.2 g of chlorine in the sample. What is the percent composition of each element in the table salt? No C4 tokol was Yh Ls rer! 4, Acompound contains 1.2 moles of carbon and 3.2 moles of hydragen, What is the percent composition by mass of each element in the compound? id . cc 24 2. : i2ml bes yg Beams) Wg B fiecig 7! ‘9G FL meal 5. inan experiment, 0.05 moles of iron and 0.05 moles of sulfur are heated ina test tube to create a new substance. What is the percent composition by mass of gach ek element i in the new compound? 2,78 tole moss 7 Va — ta bg a aise 6. chemist reat down a compound into 3.4 moles of carbon and 6.8 moles of oxygen. What is the percent composition by mass of each element in the compound?___. ______ Hoda! ass ¢ = wee LOGAB : cha Reet e eas o6.¢4.Da ed “40 Pave he 9 02 4 2 m3 7. Inanexperiment, 2.0 moles of oxygen atoms reacts with 80.1 g of calcium to form a new compound. What is the percent composition by mass of each element i in " new compound? oes. 1 = 325 yo 
