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    chem90's Avatar
    chem90 Posts: 3, Reputation: 1
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    #1

    Nov 1, 2006, 06:53 PM
    Chem
    If 40.0 grams of H3PO4 reacts with 60.0 grams of MgCO3 according to this reaction, 2H3PO4 + 3MgCO3 —> Mg3 (PO4)2 + 3CO2 + 3H2O (already balanced) then calculate the volume of carbon dioxide gas produced at STP.
    dmatos's Avatar
    dmatos Posts: 204, Reputation: 26
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    #2

    Nov 1, 2006, 09:39 PM
    Step 1 - use the molar masses to determine the number of moles of H3PO4 and MgCO3 that you have.
    Step 2 - Determine which you will run out of first in the above reaction.
    Step 3 - Figure out how many moles of carbon dioxide will be produced.
    Step 4 - Use the ideal gas law to figure out what the volume of that amount of CO2 will be.

    Run through these steps and post your answer for us to review.
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