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10 April, 05:35

Trisha and her lab partner were conducting a variety of experiments to produce gases: hydrogen, oxygen, and carbon dioxide. In one experiment, they added a piece of magnesium ribbon to 10 milliliters of hydrochloric acid. They observed bubbles being produced and did a variety of tests to identify the escaping gas; it proved to be hydrogen The reaction is represented by the following equation: Mg + 2HCl → MgCl2 + H2 (g) Trisha and her lab partner filled a beaker with 150 milliliters of a 0.10 M HCl solution. How many moles of HCl are in the beaker? Remember, molarity = moles liter. A) 0.015 mol HCl B) 0.150 mol HCl C) 6.67 mol HCl D) 15 mol HCl

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  1. 10 April, 09:10
    0
    Given:

    Volume of HCl = 150 ml

    Molarity of HCl = 0.10 M

    To determine:

    The # moles of HCl

    Explanation:

    The molarity of a solution is the number of moles of a solute dissolved in a given volume

    In this case:

    Molarity of HCl = moles of HCl/volume of the solution

    moles of HCl = Molarity * volume = 0.10 moles. L-1 * 0.150 L = 0.015 moles

    Ans: A)

    Moles of HCl is 0.015
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