chem

A solution prepared by dissolving 20.2 mL of CH3OH in 100mL of water @ 25 celcius. The final volume of the solution is 118 mL. Calculate the % by mass.
density CH3OH[0.782g/mL], H20[1g/mL] @ room temp.

  1. 👍 0
  2. 👎 0
  3. 👁 70
asked by rita
  1. %w/w = mass solute/100 g soln
    mass solute = 20.2 mL x 0.782 g/mL = ?
    mass soln = 100 g(H2O) + ?g solute = xx
    %by mass = (?g solute/xxg soln)*100 =z%

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. chem

    A solution prepared by dissolving 20.2 mL of CH3OH in 100mL of water @ 25 celcius. The final volume of the solution is 118 mL. Calculate the % by mass. density CH3OH[0.782g/mL], H20[1g/mL] @ room temp.

    asked by susan on July 22, 2011
  2. Chemistry RUSH, Please

    1) How many grams of CH4 (MM = 16.043) are needed to react with 50.0g of CL2 (MM=70.91)? 2) What is the molarity of a solution prepared by dissolving 20.0 g of methanol, CH3OH, oara sufficient water to prepare 500 mL of solution?

    asked by Maria on October 8, 2015
  3. CHEMISTRY- molality

    a sucrose solution was prepared by dissolving 13.5g sucrose in enough water to make 100ml of solution. the density is 1.050gml. calculate molality

    asked by lucy on October 9, 2010
  4. College Chem 1

    a chemistry handbook lists the solubility of NaI as 184 per 100mL of H2O at 25 degrees Celcius. 1) How many moles of NaI can be dissolved in 100mL of H2O at 25 degrees Celcius? 2) What would be the molarity of a saturated aqueous

    asked by Anonymous on November 27, 2012
  5. science/chemistry

    I have the answer but how do you solve for this problem: What is the freezing point of a sugar solution prepared by dissolving 375.00g of sucrose (342.3g/mol) in 1500.0g of water (Kf of water=1.86 degrees Celcius)?

    asked by Fisher on March 21, 2012
  6. Chemistry

    can anyone help me with this question A solution is made by dissolving 0.078g of Ca(OH)2 in water to make 100ml of final solution. Calculate the pH of the solution im not sure about how to use the 100ml. thanks -nad You need the

    asked by Nadine on June 11, 2007
  7. Chemistry

    A lab assistant prepared a potassium chloride solution for her class by dissolving 5.34 g of KCl in 152g of water. What is the mass percent of the solution she prepared? Could you help me set this up/show me how to do this

    asked by Julie on April 29, 2011
  8. Chemistry

    Calculate the molality of methanol in a solution prepared by dissolving 75.0 mL of methanol, CH3OH (d = 0.791 g/mL), in 150 g of ethanol, C2H5OH.

    asked by CC on February 10, 2010
  9. science

    A solution of ethanol water is prepared by dissolving 10ml ofethanol density 0.789g/mol in a 100ml of a solution with density 0.982g/mol.what is the cerntration of ethanol in the solution expressed in mass percent?;mass/volume

    asked by celestine on January 5, 2018
  10. Chemistry

    Find the pH of a solution prepared by taking a 50.0 mL aliquot of a solution prepared by dissolving 12.25g of NaOH and 250.0 mL of water and diluting that aliquot to 1.00L?

    asked by Audrey on January 20, 2011

More Similar Questions