chemistry

in a lab experiment to obtain the molar mass of a voltaile liquid, the following data is obtained:

volume of flask=225ml
mass of flask=77.834gms
mass of flask+gas=78.416gms
temperature=100 degrees celsius
pressure=714 torr

What is the molar mass of the liquid?

A)11.1 g/mol
B)22.6 g/mol
C)84.3 g/mol
D)99.2 g/mol

please help with working out this problem.

  1. 👍 0
  2. 👎 0
  3. 👁 207
asked by timmy
  1. Use PV = nRT
    Calculate n = number of moles of gas.

    Then mols = g/molar mass
    You know moles from the above calculation, you know grams (flask + gas - flask), solve for molar mass.

    1. 👍 0
    2. 👎 0
    posted by DrBob222
  2. wow
    didnt think of it that way.
    thanks a lot
    =)

    1. 👍 0
    2. 👎 0
    posted by timmy

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    I got think I got the following questions almost figured, but I just want someone to make sure that I am correct. 1) The whole experiment involves using the ideal gas law to predict the molar mass of an unknown liquid. The formula

    asked by Sandy on March 28, 2014
  2. Chemistry

    Hi! there's 3 questions..if you can help on any that'd be great..thanks! 1. Volatile liquids with lower boiling points often give better results than those with higher boiling points. Suggest a reason for this. 2. What effect

    asked by AG on January 20, 2007
  3. CHEMISTRY

    The mass of an erlenmeyer flask is 78.639g and the mass of the flask and water is 327.039. If the density of water is 1 g/ml then what is the true volume of the flask? so i had subtracted the mass of just the flask from the mass

    asked by Sandy on March 28, 2014
  4. chemistry

    The molar mass of a volatile liquid(one which vaporizes easily) can be determined by a the 'Dumas Method.' In this process a small amount of the liquid (a few drops) is placed in a clean flask. The mouth of the flask is covered

    asked by Dee on November 3, 2010
  5. AP Chemistry

    The molar mass of a volatile liquid (one which vaporizes easily) can be determined by a the DUMAS METHOD.' In this process a small amount of the liquid (a few drops) is placed in a clean flask. The mouth of the flask is covered

    asked by D on November 4, 2010
  1. AP Chemistry--gas law questions

    Hey, My AP Chem class did a lab for determing the molar mass of a volatile liquid by vapor density. There are a few calculations that I can't seem to get: 1.) The moles of air displaced by the volatile liquid vapor (at RT) 2.) The

    asked by Warren on November 25, 2006
  2. CHemistry....Please help

    1.SOLUBILITY: At 25C, the molar solubility of calcium phosphate in water is 1.1*10^{-7}M. Calculate the solubility in grams per liter. I m not sure how to convert M to g/L MOLAR MASS OF COLLIGATIVE PROPERTIES: 2.tert-Butyl alcohol

    asked by Saira on January 24, 2009
  3. Chemistry

    We just had a lab where our objective was to find the molar mass of Copper using electrolysis. A question on my post lab asks: Would it make a difference if Cu(NO3)2, instead of CuSO4, we’re used in the copper half cells in this

    asked by ryancon on October 30, 2018
  4. physics lab

    The experiment done in lab is repeated, using a ball that has unknown mass m. You plot your data in the form of f 2 versus M/L, with f in rev/s, M in kg, and L in m. Your data falls close to a straight line that has slope 7.82

    asked by sunny on February 24, 2014
  5. chemistry

    472 mL of H2 gas was collected over water when 1.256 g of Zn reacted with excess HCl. The atmospheric pressure during the experiment was 754 mm Hg and the temperature was 26 degrees C. A. Write the balanced chemical equation (I

    asked by Jeremiah on November 19, 2012

More Similar Questions