chemistry

posted by .

I need to know if I have th right molecular formula for Sorbito

39.56g C

7.75g H

52.7g O

Empirical Formula is CH2O

30.026 amu

how I how calculate the molecular mass and how I figure out the melecular formula? please help

  • chemistry -

    Do you mean sorbitol?

    If all the information that you have is the elemental compositions then you can only calculate the empirical formula. CH2O is NOT the correct empirical formula for sorbitol.

    C H O
    39.56% 7.75% 52.7%
    39.56g 7.75g 52.7g
    3.30mol 7.75 mol 3.29 mol
    1 mol 2.34 mol 1 mol

    which is not CH2O

    C3H7O3 is the closest

    In order to calculate the molecular formula you meed the molecular mass calculated by another means.

  • chemistry -

    In other posts of this same compound, the rest of the problem was to calculate the molar mass of sorbitol from freezing point depression data. As Dr Russ notes, that information will provide the molar mass and from that you can determine the molecular formula.

  • chemistry -

    so the molecular formula will be?

    c= 3.30/3.29=1, H=7.75/3.29=2, O=3.29/3.29=1

    2(C3H7O3)= C6H17O6

    Delta T= Kf * m

    T= -1.86 C/m * 0.33m/g

    T= o.613 C

    am i correct?

  • chemistry -

    I don't remember the numbers for the freezing point depression part of the problem, but the molar mass works out to be about 182 or so; therefore, the multiplier you have of 2 is correct. You made a typo in multiplying; however, since 2(C3H7O3) = C6H14O6 (not the H17 you typed in).

  • chemistry -

    sorry it was a typo and yes they didn't ask for the freezing point thanks so much

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry (Check)

    True or False The empirical formula of a compound is always the same as the molecular compound. My Answear: True The empirical formula for acetylene is CH. The molecular formula is C2H2. Another example: The empirical formula for glucose …
  2. Chemistry

    Please check my answers for the following questions. THANK YOU. 1) The empirical formula of a compound that is 25.9% nitrogen and 74.1% oxygen is.... ANSWER: N2O 2) empirical formula of a compound that consists of 4.80 grams of carbon, …
  3. chemistry

    If a compound's empirical formula is CH2O and its' formula mass is 120.12 amu, what is its' molecular formula
  4. 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 molecular …
  5. chem

    Citric acid, the compound responsible for the sour taste of lemons, has the following elemental composition: C, 37.51%; H, 4.20%; O, 58.29%. Calculate the empirical formula of citric acid. so i did that and got C6H8O7 but now i need …
  6. 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 percent …
  7. 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 percent …
  8. Finding the Molecular Formula

    A certain compound containing only carbon and hydrogen was found to have a vapor density of 2.550 g/L at 100 degrees C and 760 mm Hg. If the empirical formula of this compound is CH, what is the molecular formula of this compound?
  9. Chemistry

    An organic compound that has the empirical formula CHO has a molecular mass of 145 amu. Its molecular formula is?
  10. Chemistry

    An organic compound consists of only carbon, hydrogen, and oxygen. Through combustion analysis, 5.671g of water and 36.933g of carbon dioxide are formed from 17.422g of sample. C:12.0 amu O: 16.0 amu H:1.0 amu In the space provided …

More Similar Questions