Polyethylene is a synthetic polymer or plastic with many uses. 1.44 g of a polyethylene sample...
Polyethylene is a synthetic polymer or plastic with many uses. 1.44 g of a polyethylene sample was dissolved in enough benzene to make 100. mL of solution, and the osmotic pressure was found to be 1.86 torr at 25oC. What is the approximate molar mass of the polyethylene?
Homework Answers
PI = MRT
PI = osmotic pressure
M = concnetration in mol per liter
M = mol/L
L = 100 ml = 0.1 L
R= 0.082 ideal gas constant
T = 25 °C = 298 K
then
PI = mol/L * R
mol = PI*L/(RT)
PI = 1.86 torr = 1.86/760 = 0.00244736842 atm
mol = 0.00244736842/0.1/(0.082*298) = 0.00100154215 mol of plastic
MW = mass/mol
MW = 1.44/0.00100154215 = 1437.782 g /mol of polyethylene
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