Chemistry

posted by .

A 3.000 gram sample of an unknown compound containing the elements carbon, hydrogen, and nitrogen is analyzed by combustion. The combustion releases 4.714 grams of carbon dioxide and 1.500 grams of nitrogen. If 25 molecules have a combined mass of 4.65 x 10⁻²¹ grams, what is the compound's molecular formula?

Thank you.,

  • Chemistry -

    Convert 4.714g CO2 to g C.
    Convert 1.500g N2 to g N.
    g H = 3.00-gC-gN

    moles C = ?
    moles H = ?
    moles N = ?
    Find the empirical formula.
    The molar mass will be
    4.65E-21 x (6.022E23/25) = ?
    Then (molar mass/empirical mass) = n which you round to a whole number, then
    molecular formula = (empirical formula)n
    This post is not on page 1. If you have problems with it I suggest you repost at the top of the board and show your work; otherwise, we may not scroll down 3-4 pages looking for work to do, especially if there are more than enough questions on the first page. ;-).

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. 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, …
  2. ap chemistry

    18. Answer the following question that relate to the analysis of chemical compounds. (a) A compound containing the elements C, H, N, and O is analyzed. When a 1.2359g sample is burned in excess oxygen, 2.241g of CO2(g) is formed. The …
  3. Chemistry

    Many homes in rural America are heated by propane gas, a compound that contains only carbon and hydrogen. Complete combustion of of a sample of propane produced 2.641 grams of carbon dioxide and 1.422 grams of water as the only products. …
  4. Chemistry

    An unknown compound contains carbon, hydrogen, and oxygen. When burned, a 2.000 gram sample of this compound releases 3.451 g of carbon dioxide and 1.059 grams of water. What is the empirical formula of this compound?
  5. smk lutong

    A compound consists only of carbon, hydrogen, nitrogen, and oxygen.  Combustion of 10.68 g of the compound  produced 16.01 g carbon dioxide and 4.37 g of water.  the molsr mass of the compound is 176.1 …
  6. chemistry

    a compound contains 5.2% by mass Nitrogen. It also contains carbon, hydrogen and oxygen. Combustion of 0.085g of the compound produced 0.224g of carbon dioxide and 0.0372g of water. Calculate the empirical formula of the compound.
  7. chemistry

    An unknown compound contains only carbon, hydrogen, and oxygen (CxHxOx). Combustion of 3.50G of this compound produced 5.13G of carbon dioxide and 2.10G of water A.How many moles of carbon, , were in the original sample?
  8. chemistry

    a 2.52-g sample of a compound containing only carbon, hydrogen, nitrogen, oxygen, and sulfur was burned in excess O to yield 4.23 g of CO2 and 1.01 g of H2O as the only carbon and hydrogen containing products respectively. Another …
  9. chemestry

    A compound contains only carbon, hydrogen, nitrogen, and oxygen. Combustion of 0.157g of the compound produced 0.123g carbon dioxide and 0.0310g water. In another experiment, it is found that 0.103g of the compound produces 0.0230g …
  10. chemistry

    Suppose a substance has been prepared that is composed of carbon, hydrogen, and nitrogen. When 0.1156 gram of this compound is reacted with oxygen, 0.1638 gram of carbon dioxide (CO2) and 0.1676 gram of water (H2O) are collected. Assuming …

More Similar Questions