A solution contains 0.8960 g of K2SO4 in 500 ml solution. Its osmotic

1.	A solution contains 0.8960 g of K2SO4 in 500 ml solution. Its osmotic pressure is found to be 0.690 atm at 27°C. calculate the value of vant hoff factor.
Answer» MB = WB RT/ ∏ V WB = 0.8960 g V = 500 ml p_A⁰ = 0.5 L R = 0.082 L atm K^-1 mol^-1 ∏ = 0.69 atm T = 300 K M = 0.896 g x 0.082 L atm K^-1 mol^-1 x 300 K = 0.69 atm x 0.5 L = 63.9 g mol^-1 Normal molar mass = 2 x 39 + 32 + 4 x 32 = 174 g mol^-1 molar mass/ Observed molar mass = 174 g mol^-1 = 2.72 = 63.9 g mol^-1

A solution contains 0.8960 g of K2SO4 in 500 ml solution. Its osmotic pressure is found to be 0.690 atm at 27°C. calculate the value of vant hoff factor.

Answer»

MB = WB RT/ ∏ V

WB = 0.8960 g V = 500 ml p_A⁰ = 0.5 L

R = 0.082 L atm K^-1 mol^-1

∏ = 0.69 atm

T = 300 K

M = 0.896 g x 0.082 L atm K^-1 mol^-1 x 300 K

= 0.69 atm x 0.5 L = 63.9 g mol^-1

Normal molar mass = 2 x 39 + 32 + 4 x 32

= 174 g mol^-1

molar mass/ Observed molar mass

= 174 g mol^-1 = 2.72

= 63.9 g mol^-1

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A solution contains 0.8960 g of K2SO4 in 500 ml solution. Its osmotic pressure is found to be 0.690 atm at 27°C. calculate the value of vant hoff factor.

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