Chemistry

Alcohol levels in blood can be determined by a redox titration with potassium dichromate according to the balanced equation:

C2H5OH(aq) + 2Cr2O7(-2) (aq) + 16H+(aq)---> 2CO2 (g) + 4 Cr3(+)(aq) + 11H2O (l)
What is the blood alcohol level in mass perecent if 8.76 mL of 0.04988 M K2Cr2O7 is required for titration of a 10.0002 g sample of blood?

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  1. moles dichromate = M x L = xx.
    moles alcohol = 1/2 of xx.
    grams alcohol = moles alcohol x molar mass.
    % alcohol = (mass alcohol/total mass)*100

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  2. Given 10.0 L of Nitrogen at -78 deg C. What volume will the Nitrogen occupy at 25 deg C (P is constant)?

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  3. If you wish to post a question of your own, I suggest you go to the top of the page, click on Post a new question, and type in your question. Posting piggy back style often goes unanswered. In this case, use PV = nRT.

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  4. which part is the alcohol

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