Lab 5- Chemical Formulas

Lab 5- Chemical Formulas - Date performed: 9/28/10 Name:...

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Unformatted text preview: Date performed: 9/28/10 Name: Brian Lubnow Date Submitted: 10/05/10 Partner: Rebekah Balint Instructor: Alex Xu Experiment 5: Determination of a Chemical Formula Objective: The objective of this lab is to determine the percent composition and formula for an oxide of copper. It also is a lesson in stoichiometry. Experimental Data Mass of Test Tube 19.63 0.01g Mass Test Tube with Copper Oxide 21.570.01g Mass after reaction 21.210.01g Sample Calculations New Uncertainty(addition/Subtraction): = + = . + . = . sr sa2 sb2 0 012 0 012 0 01 New Uncertainty(multiplication/division): = + srR2 saA2 sbB2 = . . + . . = . sr182 0 01 362 0 011 942 sr 0 51 Mass Oxygen = 21.57g-21.21g= .36g0.01g Mass Copper = 21.21g-19.63g= 1.580.01g Mass % Oxygen = . . = % 36g1 94gx100 18 0.51% Mass % Copper = . . = . % 1 58g1 94gx100 81 4 0.66% Moles Oxygen: = moles massmolar =. . . . = . . mass 36g 0 01g16 0g 0 01g 0 02 0 0005 moles 1 Moles Copper: = moles massmolar = . . . . = . . mass 1 58g 0 01g63 55g 0 01g 0 02...
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Lab 5- Chemical Formulas - Date performed: 9/28/10 Name:...

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