In a study designed to prepare new gasoline-resistant coatings, a polymer chemist dissolves 6.053 g of polyvinyl alcohol) in enough water to make 100.0 mL of solution. At 25∘C, the osmotic pressure of this solution is 0.272 atm. What is the molar mass of the polymer sample?

Question

tabuordg · Accepted Answer

Step 1  First we can calculate molarity (M) using the following equation where II stands for osmotic pressure in atm, T stands for temperature in K and R stands for gas constant (R=0.821atm×Lmol×K):  Π=MRT  M=ΠRT  =0.272atm0.0821 atm L mol−1K−1×298.15K  =0.011mol L−1  Now we can use that to calculate the amount of moles (n):  M=nsoluteVsoln  nsolute=M×Vsoln  =0.011 mol L−1×100×10−3L  =1.1×10−3mol  Finally, we can calculate molar mass of the polymer:  n=mM  M=mn=6.053g1.1×10−3mol  =5502.73g mol−1

In a study designed to prepare new gasoline-resistant coatings, a polymer chemis

Answered question

Answer & Explanation

New Questions in College Statistics