± Masses of Components in a Mixture Part A An organic liquid is a mixture of met

Question

± Masses of Components in a Mixture Part A An organic liquid is a mixture of methyl alcohol CH3 OH) and ethyl alcohol (C2H; OH). A 0.220-g sample of the liquid is burned in an excess of O2(g) and yields 0.387 g CO2(g) (carbon dioxide) Set up two algebraic equations, one expressing the mass of carbon dioxide produced in terms of each reagent and the other expressing the mass of sample burned in terms of each reagent. What is the mass of methyl alcohol (CH3 OH) in the sample? Express your answer numerically in grams. Hints mass of CH3 OH Submit My Answers Give Up

Explanation / Answer

Suppose mass of methyl alcohol = W g

Mass of ethyl alcohol = (0.220 – W)

                                       CH3OH    +    3/2O2      =       CO2    +      2H2O

Molar mass (g/mol):   32.04                                      44.01

Mass of CO2 produced from methyl alcohol = (44.01/32.04)W

                                     CH3CH2OH    +      3O2      =       2CO2    +      3H2O

Molar mass (g/mol):   46.07                                        44.01

Mass of CO2 produced from methyl alcohol = (2 x 44.01/46.07)W

Total CO2 produced =

(44.01/32.04)W + (2 x 44.01/46.07)W = 0.387

1.374 W + 1.911 W = 0.387

3.285 W = 0.387

W = 0.1178

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