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

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

This preview shows page 1. Sign up to view the full content.

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,
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: respectively) at 25ºC. The value of the universal gas constant that you need for this calculation is 0.082 L·Atm·K-1 ·M-1 . The atomic weight of argon is 40 g/mol. The molar concentration of argon in these conditions can be calculated as ± ² ± ² ± ² ± ² ± ² 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 ³ ³ ³ u ± ² ± ² ± ² ± ² ± ² ± ² 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 ´ ³...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online