The first five questions on this Concept Check refer to the same common organic

Question

The first five questions on this Concept Check refer to the same common organic acid, which is composed of only carbon, hydrogen, and oxygen. "When 0.6943 g of this common orgainc acid was subjected to combustion analysis (see Ch. 3.2), it produced 1.471 g CO_2 and 0.226 g H_2O." How many grams of carbon are contained in 1.471 g of CO_2? How many grams of hydrogen are contained in 0.226 g of H_2O? 0.4014 g C and 0.0253 g H 1.471 g C and 0.226 g H Not enough information provided 1.000 g C and 2.000 g H Use your answer to Questions #1 & #2 above to calculate the mass of oxygen contained in 0.6943 g of the common organic acid. Do NOT include the units in your numerical answer - the units are assumed to be grams.

Explanation / Answer

Ans. in CO2, mass fraction of carbon = 12/(12+32) = 0.273

so in 1.471 gm CO2, mass of carbon = 1.471*0.273 = 0.4014 gm

in H2O, mass fraction of hydrogen = 2/18 = 0.111

so in 0.226 gm H2O, mass of hydrogen = 0.226*0.111 = 0.0253 gm

So option (a) is correct.

so

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