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    JARMAR's Avatar
    JARMAR Posts: 1, Reputation: 1
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    #1

    Mar 7, 2010, 12:56 PM
    Chemistry
    How many grams of calcium are required to free 4 moles of hydrogen gas from hydrochloric acid,hci?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Mar 8, 2010, 07:09 AM

    1. Write down the chemical equation for the reaction.
    2. Balance the equation.
    3. From the balanced equation, find the mole ratio between Calcium ions and hydrogen gas.
    4. Work out the number of moles of calcium required to liberate 4 moles of hydrogen gas from the mole ratio alone.
    5. You have the number of moles of calcium, work out the mass of that amount of calcium.
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