he average temperature of seawater in Tampa Bay is 30.2 and the average seawater
ID: 563924 • Letter: H
Question
he average temperature of seawater in Tampa Bay is 30.2 and the average seawater temperature in San Francisco is 13.7'C. What is the difference in the osmotic pressure of seawater between these two locations? (Assume that only NaCI is dissolved in the seawater and that both locations have a salt concentration of 25 g/L) = MRT is the osmotic pressure M is the molar concentration of dissolved species R is the ideal gas constant T is the temperature in Kelvin Hint: remember to use the correct version of the ideal gas constant, R. Hint: remember to convert the given temperatures and concentration to the correct units. 1.1 atm 3.2 atm 0.6 atm 0.8 atmExplanation / Answer
Ans : 0.6 atm
T1 = 30.2 degree C = 303.35 K
T2 = 13.7 degrees C = 286.85 K
Molarity = number of moles of NaCl / volume of solution in L
M = (25 / 58.4) / 1
= 0.428 M
R = 0.0821 L.atm/mol.K
Using the formula mentioned in the picture , the osmotic pressures will be :
OP1 = 0.428 x 0.0821 x 303.35
= 10.66 atm
OP2 = 0.428 x 0.0821 x 286.85
= 10.08 atm
Op1 - Op2 = 10.66 - 10.08
= 0.6 atm
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