1. Questions

Chemistry

what is the molecular formula of a compound that is 54.5% C, 9.09% H, and 36.4% O. with a molecular weight of 176g/mol.

A)C8H16O4
B)C4H8O2
C)C7H12O5
D)C9H18O3


Assume you have 100 g of the substance, then you have 54.5g of C, etc.

Moles C= 54.5/12=4.54 mol
Moles H=
Moles O=

Then, divide all these moles each by the lowest in the table above. That will give you the empirical formula, example
where the mole mass is 220
Moles C= 3.2
Moles H= 6.4
Moles O= 19
divide by lowest, 3.2
Moles C= 1
Moles H= 2
Moles O= 6
CH2O6 empirical formula, emperical molmass is 12+2+6*16= 110 Divide this into the given mol mass (220/110=2), so multiply the atom ratios by this: mol formula C2H4O12

So finish the problem, if you get stuck, repost


how do u get the empirical molmass ?? nowher in the sample ugave s thre a 12 2 a 6 and why multiply by 16??


The empirial mass is the sum of the atoms atomic mass in the empirical formula

CH2O6 C is 12, H is 1, but there are two of them, and there are 6 O or 6*16. Sum is the empirical mass.

  1. 👍
  2. 👎
  3. 👁
Justyna

  1. kmno4

    1. 👍
    2. 👎
    cristobal

  2. kmno4 + c3h8o3

    1. 👍
    2. 👎
    cristobal

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry..

    The empirical formula of a compound is CH2. The molecular formula of this compound could be which of the following? a) CH4 b) C2H2 c) C2H4 d) C2H6

  2. chemistry

    Fumaric acid, which occurs in many plants, contains, by mass, 41.4% carbon, 3.47% hydrogen, and 55.1% oxygen. A 0.050-mol sample of this compound weighs 5.80 g. The molecular formula of this compound is can you show me the formula

  3. Chemistry

    A compound has an empirical formula of CH2 and molecular mass of 84g. What is it's molecular formula?

  4. Chemistry

    A compound contains only nitrogen and hydrogen and is 87.4% nitrogen by mass. A gaseous sample of the compound has a density of 0.977 g/L at 680. torr and 84.1°C. What is the molecular formula of the compound?

  1. Chemistry

    a compound has an empirical formula of C3H5O2 and a molar mass of 145,14g. what is the molecular formula of this compound?

  2. Chemistry

    Find the molecular formula of a compound that is 48.38% carbon, 8.12% hydrogen, and 53.5% oxygen by mass and has a molecular weight of 328 g/mol.

  3. 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

  4. Chemistry

    a compound has an empirical formula CH20 and molecular mass of 90 determine it's molecular formula(H=11; C=12; 0=16)

  1. Chemistry

    Analysis of a sample of an organic compound showed it contains 39.9%carbon,6.9%hydrogen and 53.2%oxygen. a)calculate the empirical formula b)if the relative molecular mass is 60,what is the molecular formula of the

  2. Chemistry

    When a 1.200g sample of a compound containing carbon, hydrogen, and nitrogen was combusted using exess oxygen, 2.929g of CO2 and 0.8001g of H2O were obtained. Analasys of the compounds showed the molecular mass to be 108.16g/mol.

  3. 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

  4. Chemistry

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

You can view more similar questions or ask a new question.