chemistry- empirical formulas

posted by .

Calculate the empirical formula of a molecule with the following percent compositions: 55.0% gallium (Ga) and 45.0% fluorine (F).
mass of 100g #of Moles in 100g
of the compound

Ga55.0% _____ ______

F45.0% ______ _______








c. Determine the molecular formula of a molecule having an empirical formula of NH2 and a molar mass of 32 g/mol.

  • chemistry- empirical formulas -

    Take a 100 g sample which will give you
    55.0 g Ga and
    45.0 g F
    Convert to mols.
    55.0/atomic mass Ga = ?
    45.0/atomic mass F = ?
    Now find the ratio of the elements to each other with the smallest being 1.00. The easy way to do this is to divide the smaller number by itself(which gives 1.00), then divide the other number by the same small number. Round to whole numbers. Post your work if you get stuck.

    c.
    empirical formula = NH2. empirical formula mass = 14 + 2(1.00) = 16
    molar mass = 32
    16*n = 32
    n = 2; therefore, the molecule consists of two units of NH2.
    (NH2)2 or N2H4.
    Check. 2N + 4H = 2(14) + 4(1) = 28 + 4 = 32. must be right.

  • chemistry- empirical formulas -

    since i don't have a teacher. I tried and this is what i came up with.
    55.0/atomic massGa
    55.0/69.723= 1.27 (rounded)
    45.0/atomic massF
    45.0/18.998404= 2.37 (rounded)
    If this is corect what do I do after this. If not can you help me with an headstart please.?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. 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 …
  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 - empirical formula

    write the empirical formula for each of the following molecular formulae" a)P4O10 b)C2H6 Confused as to what the diff.is b/w empirical and formula...have no idea how to answer these b/c they look like empirical formulas to me
  4. chemistry

    1.to calculate the percent by massof an element in a known compound, divide the mass of the element in one mole by the _______and multiply by 100%. A(n) _______formula represents the lowest________ratio of the elements in a compound. …
  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. Chemistry

    2) What is the empirical formula of a compound containing C, H, O if combustion of 1.23g of the compound yields 1.8g CO2 and .74g of H2O 3) What are the empirical and molecular formulas of a hydrocarbon if combustion of 2.10g of the …
  9. Chemistry, empirical formula

    Determine the empirical formula for the following compounds with these compositions (by mass): a) Cr 47.7% F 52.3% b) Na 42.1% P 18.9% O 39.0%
  10. 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 with …

More Similar Questions