chemistry

Determining a Molecular Formula from an Empirical Formula

1. A compund has an experimental molar mass of 78g/mol. Its empirical formula is CH. What is its molecular formula?

  1. 👍 0
  2. 👎 0
  3. 👁 114
asked by jaz
  1. The idea here is to see how many CH groups you have or put another way (CH)x where you want to determine x.
    So if x is 1, what would the molar mass be? It would be 12 for C + 1 for H = 13 for the CH. If x = 2, then the molar mass would be 26. If x = 3, the molar mass would be 3 x 13 = 39. So what time 13 = 78 (or close to it).

    1. 👍 0
    2. 👎 0
  2. 13 times 6 =78

    1. 👍 0
    2. 👎 0
    posted by jaz
  3. CH=78g/mol
    but the relative atomic mass of C=12 and H=1
    therefore the molecular mass would be
    (12+1)n=78 g/mol
    13n = 78 g/mol
    n=6

    the molecular formula is C6H6 .

    1. 👍 0
    2. 👎 0
    posted by Joseph

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    Determining a Molecular Formula from an Empirical Formula 1. A compund has an experimental molar mass of 78g/mol. Its empirical formula is CH. What is its molecular formula?

    asked by chrissy on March 24, 2009
  2. Chemistry

    If you divide the molar mass of a compound by the empirical formula mass, what is the result? That division should be VERY close to a whole number. Usually, 0.9 to 1.1 or 1.9 to 2.1 (all depending upon the accuracy and precision

    asked by Chris on February 4, 2007
  3. chemistry--help

    a compound contains 63.15% Carbon, 5.30% hydrogen, 31.55% oxygen. Its molar mass is 152.14 g/mol. determine the empirical and molecular formula. I get the empirical formula to be C8H803 is it right because it is not fitting the

    asked by amy on February 10, 2011
  4. Chemistry

    I need some help with some of these questions: The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name implies, it stinks! It is 58.77 percent carbon, 13.81 percent hydrogen, and 27.40

    asked by Matthew on February 20, 2012
  5. Chemistry

    I need some help with some of these questions: The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name implies, it stinks! It is 58.77 percent carbon, 13.81 percent hydrogen, and 27.40

    asked by Matthew on February 20, 2012
  6. chemistry

    A compound is found to be 51.39% carbon, 8.64% hydrogen, and 39.97% nitrogen. It has a molecular molar mass of 140.22 g/mol. (This question requires one to find the empirical formula to end up with the final answer in molecular

    asked by spartan on January 10, 2019
  7. chemistry

    Benzene has the empirical formula CH and an experimental molar mass of 78 g/mol. What is its molecular formula? Explain how you got your answer.

    asked by Brittney on April 19, 2012
  8. Chemistry

    Use the experimental molar mass to determine the molecular formula for compounds having the following analyses. A. 41.39% carbon, 3.47% hydrogen, 55.14% Oxygen; experimental molar mass 116.07 I got C4H4O4 as the molecular formula.

    asked by Chopsticks on January 25, 2009
  9. Chemistry

    I'm confused on how to set up the problem for each question.. 1.) Calculate the empirical formula of a compound if a 6.21 g sample contains 1.67g of cerium and the remainder iodine 2.) An unknown compound contains 85.64% carbon

    asked by Lina on January 16, 2016
  10. Chemistry Really Confused!!

    'm confused on how to set up the problem for each question.. 1.) Calculate the empirical formula of a compound if a 6.21 g sample contains 1.67g of cerium and the remainder iodine 2.) An unknown compound contains 85.64% carbon

    asked by Lina on January 16, 2016

More Similar Questions