Chemistry

posted by .

A .1360 g sample of a mixture of magnesium and calcium carbonates when treated with HCL evolves 32.25 cm cubed of carbon dioxed measured dry at STP. Calculate the percent of magnesium carbonate in the mixutre.

  • Chemistry -

    I am going to show you how to do this problem using chemical factors to convert from one material to another. This isn't taught in classes anymore but it sure is convenient.
    Let x = mass MgCO3
    then y = mass CaCO3
    ===================
    X + Y = 0.1360g
    X(molar mass CO2/molar mass MgCO3) + Y(molar mass CO2/molar mass CaCO3) = (0.03225*44/22.4)
    Solve the two equations simultaneously for X and Y (actually, X is all you need). Then %MgCO3 =(mass MgCO3/mass sample)*100 = ??
    [Note: molar mass CO2/molar mass MgCO3 convert X(grams MgCO3) to grams CO2. Similarly, molar mass CO2/molar mass CaCO3 conerts Y(grams CaCO3) to grams CO2. Both of these are chemical factors. On the right hand side, the 32.25 cc converts to 0.03225L and that divided by 22.4 converts to moles CO2. That multiplied by 44 converts to grams CO2 so basically we have the equation 2 just grams CO2 in terms of X + grams CO2 in terms of Y = grams CO2 attained.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    What are the balanced equation for the following reactions: HCl and Sodium Hydrogen Carbonate HCl and Copper oxide HCl and Calcium carbonate HCl and Magnesium NaOH and Ammonium Chloride
  2. CHEMISTRY

    A 2.800-g mineral sample was analyzed for its calcium carbonate, CaCO3, content by titrating it with hydrochloric acid (the reaction products are calcium chloride, carbon dioxide, and water). The sample required 28.48 mL of a 0.1505 …
  3. science

    1. what weight in grams of magnesium oxide will produce from burning 96 grams of magnesium?
  4. Chemistry

    Calcium carbonate is insoluble in water. Name two substances that when mixed in solution, will form a precipitate of calcium carbonate. Explain why is it the two substances that you have chosen. ¬†why does magnesium chloride cannot …
  5. Chemistry

    I have 3 I don't understand how to do. A 33.2 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 12.3 grams. What was the percent …
  6. chemistry

    A sample being given as a laboratory unknown is a mixture of calcium carbonate and magnesium carbonate. Both substances decompose to form calcium oxide and magnesium oxide, respectively, when heated at a high temperature for a prolonged …
  7. Chemistry

    a 110 g solid sample that is a mixture of CaCO3 and CaCl2 is reacted with 1.50 L of 1.45M HCl. Of the calcium salts, only calcium carbonate reacts with HCl- the reaction forms CaCl2 and CO2. The excess/unreacted HCl requires 0.850 …
  8. Chem

    What is the molarity (M) of an HCl solution, 150 ml of which when treated with excess magnesium liberates 3.5 l of H2 gas measured at STP?
  9. chemistry calculations

    An ore sample with a mass of 670 kg contains 27.7% magnesium carbonate .If all of the magnesium carbonate in this ore sample is decomposed to form carbon dioxide ,describe how to determine what mass of carbon dioxide is evolved during …
  10. Chemistry

    A tablet containing calcium carbonate and fillers with a mass of 1.631 g was dissolved in HCl. After the fillers were filtered out, the HCl was neutralized by adding sodium carbonate. The resulting precipitate was pure calcium carbonate …

More Similar Questions