Calculate the molality (m) of a 7750 g sample of a solution of thesolute methano

Question

Calculate the molality (m) of a 7750 g sample of a solution of thesolute methanol dissolved in the solvent tetrahydrofuran if thesample contains 7.50 mol of methanol.


Molar Mass (g/mol) CH3OH 32.04 C4H8O 72.12 Density ( kg/m3 ) CH3OH 791.4 C4H8O 889.2 Calculate the molality (m) of a 7750 g sample of a solution of thesolute methanol dissolved in the solvent tetrahydrofuran if thesample contains 7.50 mol of methanol.


Molar Mass (g/mol) CH3OH 32.04 C4H8O 72.12 Density ( kg/m3 ) CH3OH 791.4 C4H8O 889.2

Explanation / Answer

                     mass of the solution = 7750g             number of moles of methanol = 7.50      7.50 = mass /32.04      mass of solute = 7.50 x 32.04 =240.3g     mass of solvent = 7750 - 240.3 =7509.7 g        molality of solution = (7.50 x 1000) /7509.7                                 = 0.998 m

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