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Alcohol (C2H5OH) levels in blood can be determined by a redox titration as follows: C2H5OH (aq)...

Alcohol (C2H5OH) levels in blood can be determined by a redox titration as follows:

C2H5OH (aq) + 2 Cr2O7 2- (aq) + 16 H+  2 CO2 (g) + 4 Cr3+(aq) + 11 H2O

(a) How many grams of alcohol are in a blood sample if 8.76 mL of 0.04988M K2Cr2O7 is required for its complete titration?

Suppose the sample of blood in Part (a) weighed 10.002 g, what is the mass % of alcohol in the sample?

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Answer #1

(a) Number of moles of dichromate ions moles.
2 moles of dichromate ions will oxidize 1 mole of ethanol.
0.000437 moles of dichromate ions will oxidize moles of ethanol.
Molar mass of ethanol is 46 g/mol. Mass of ethanol is g.
(b) Mass percent of alcohol in the sample %

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