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harks People Window Help NDAMENT × + Buffalo State College . CHE 11x Search Textbook SolutionsICx + www.saplinglearning.com/ibiscms/mod/ibis/view.php?id-6014617 D Banner@ Buffalo Text Book Nova T... S Slader Texbook Dropbox Jump to... Sapling Learning Ma Shern a 72fof a e is dissolved in water to make 135 ml of solution at 21 c, the exerts an osmotic pressure of 871 torr. What is the molar concentration of the solution? Number How many moles of solute are in the solution? Number mol What is the molar mass of the solute? Number g/mol Previcus Give Up & View Solution Check Answer NextE > ? Hint

Explanation / Answer

Answer

Given:

Weight of solute W=3.72 g

Volume of solution V=135ml

Osmotic pressure P= 871 torr =871 x 0.001315 atm=1.15 atm

Temperature =21°C=21+273=294°K

Formula for osmotic pressure

P= CRT

Where C is concentration in Molarity

R Is Gas constant = 0.08205 L atm mol-1 K-1

Therefore

1.15=C x 0.08205 x 294

C = 0.04767 mol/L

Also

Molarity C = n/V

Where n is number of moles

V is volume of solution in litre

Therefore

n = C x V

n = 0.04767 x 0.135

n = 0.006435

Also

n =W/M

Where M is molar mass of solute

M= W / n

M =3.72/0.006435

M = 578

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