CEE 350 - Korshin - Winter 2012 - Quiz 1(1)

CEE 350 - Korshin - Winter 2012 - Quiz 1(1) - respectively)...

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Class CEE 350 Pop-up quiz #1 solution The molar concentration of urea (NH 2 ) 2 CO in human urine is about 0.15 mol/L. Assuming that the average daily excretion rate is about 2 L/day, determine the weight of daily excreted urea. Atomic weights of nitrogen, hydrogen, carbon and oxygen are 14, 1, 12 and 16 g/mol, respectively. The molecular weight of urea is 2·(14+2)+12+16=60 g/M. Correspondingly the weight of urea in one liter of urine is 0.15·60=9 g. The amount of urea excreted daily is thus 2·9=18 g/day. The partial pressure of argon at the sea level is 0.01 Atm. Determine the molar and weight concentrations or argon (in mol/L and mg/L of air,
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Unformatted text preview: respectively) at 25C. The value of the universal gas constant that you need for this calculation is 0.082 LAtmK-1 M-1 . The atomic weight of argon is 40 g/mol. The molar concentration of argon in these conditions can be calculated as air Ar air Ar L mol mol K Atm L K Atm RT P L mol C / 10 09 . 4 082 . 2 . 298 01 . / 4 1 1 u air air air Ar Ar air Ar L mg L mol mol mg L mol C mol mg AW L mg C / 4 . 16 / 10 09 . 4 / 000 , 40 / / / 4 u...
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