Combustion Analysis A 0.1156g sample composed of C, H, N is burned to produce 0.1638g CO2 and 0.1676g H2O Assume all C in the sample is converted to CO2.

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Presentation transcript:

Combustion Analysis A 0.1156g sample composed of C, H, N is burned to produce 0.1638g CO2 and 0.1676g H2O Assume all C in the sample is converted to CO2 Assume all H is converted to H2O To solve: All C CO2, all HH2O (N is remainder) Convert g CO2 to moles CO2 then find moles C Convert g H2O to moles H2O, then find moles H -gN = 1 1

Yield Theoretical yield = calculated amount of product Use stoichiometry Experimental yield = actual yield Amount obtained in a lab Would be given in a problem “obtained”, “recovered”, etc. Percent yield = experimental/theoretical x 100 Normally less than 100% Incomplete reaction Impure reagents Experimental error Side reactions 2 2