Homework Help: Chemistry

Posted by Mary on Friday, March 26, 2010 at 9:01pm.

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?

Chemistry - DrBob222, Saturday, March 27, 2010 at 12:01am
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
Chemistry - Anonymous, Saturday, March 27, 2010 at 12:21am
Given 10.0 L of Nitrogen at -78 deg C. What volume will the Nitrogen occupy at 25 deg C (P is constant)?
To annonymous - DrBob222, Saturday, March 27, 2010 at 12:46am
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.
to DrBob222 - Renee, Thursday, March 31, 2011 at 8:55pm
which part is the alcohol

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