Post a New Question


posted by .

Hi the following comes from my first homework assignment in AP Chemistry. I am totally lost on this question and don't know where to start. Thanks a lot in advance!!!!!

A 0.1247 g sample of ascorbic acid, Vitamin C, was burned in a carbon-hydrogen combustion apparatus to produce 0.1869 g of carbon dioxide, and 0.0510 g of water. Ascorbic acid contains only carbon, hydrogen, and oxygen. Determine the masses of C,H, and O in the sample and then determine the simplest formula.

  • chem -

    Convert 0.1869 g CO2 to g C.
    0.1869 g CO2 x (1 mol C/1 mol CO2) = ?? g C.

    Convert 0.0510 g H2O to g H.
    0.0510 g H2O x (2 mols H/1 mol H2O) = ?? g H

    Determine g oxygen by adding g C and g H and subtracting from the 0.1247 g sample initially taken.

    Then the simplest (empirical formula) is determined by converting g C, H, and O to mols
    mols C = g C/atomic mass C = xx mols C.
    mols H = g H/atomic mass H = xx mols H.
    mols O = g O/atomic mass O = xx mols O.
    Now find the ratio of the three in simplest numbers; i.e., divide the smallest number by itself (thereby making it 1.00) and divide the other two numbers by the smallest number. Post your work if you get stuck.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

More Related Questions

Post a New Question