chemistry

what is the percent composition by mass of water in a compound with a gram formula mass of 4905 g/mol

  1. 👍 0
  2. 👎 0
  3. 👁 92
asked by mike
  1. Do you hope to obtain a number out of this?
    %H2O = (mass water/formula mass)*100 = ??
    Without the mass of water or the formula of the compound, a number is not possible.

    1. 👍 0
    2. 👎 0
  2. it only tells me that and that gypsum contains 2 moles of water for each 1 mole of calcium sulfate from CaSO4*2H20

    1. 👍 0
    2. 👎 0
    posted by mike
  3. That's all you need.
    g H2O = 2 moles H2O = 2*molarmass H2O.
    Then %H2O = (2*molar mass H2O/molar mass CaSO4.2H2O)*100 = ??

    This looks simple enough; however, I don't believe CaSO4.2H2O has a molar mass even close to 4905 g/mol.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. 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

    asked by Anonymous on March 24, 2009
  2. 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

    asked by Matthew on February 20, 2012
  3. 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

    asked by Matthew on February 20, 2012
  4. 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.

    asked by Chansa on June 3, 2016
  5. AP Chemistry

    An organic compound was synthesized and found to contain only C, H, N, O, and Cl. It was observed that when .150g sample of the compound was burned, it produced .138g of CO2 and .0566g of H2O. All the Nitrogen in a different .200g

    asked by Monique on September 15, 2009
  6. Chemistry (Check)

    Classify each of these statements as always true, sometimes true, or never true. 7____AT____It is necessary to know the formula of a compound in order to calculate its percent composition. 8___ST_____If the percent by mass of

    asked by Bryan on February 11, 2007
  7. Chemistry

    Completion To calculate the percent composition of a known compound, start with chemical formula of the compound and calculate the ________ which gives the mass of one mole of the compound. formula mass. molecular mass.

    asked by Bryan on February 4, 2007
  8. CHEMISTRY

    Do you think it is more useful to have the percent by mass of water in hydrate or the percentage composition, assuming that you know the formula for the associated dehydrated compound? Can someone please explain what's the meaning

    asked by cazzy on April 26, 2013
  9. Chem

    A sample of an unknown biochemical compound is found to have a percent composition of 55.03 percent carbon, 5.54 percent hydrogen, 32.10 percent nitrogen and the balance oxygen. What is the simplest formula for this compound ? How

    asked by Melinda on October 4, 2012
  10. Chemistry

    For Peroxyacyl nitrate (PAN) A compound of C,H,N,O Determine the empirical formula from the percent composition by mass: 19.8% C, 2.50% H, 11.6% N What is its molecular formula given that its molar mass is about 120g?

    asked by Amy~ on August 25, 2010

More Similar Questions