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24 February, 21:38

What volume of hydrogen gas is evolved from a reaction between 0.52 g of Na and water? This gas is collected at 20 C and 745mmHg

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  1. 24 February, 22:59
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    The volume of hydrogen gas that evolved is calculated as follows

    by use of ideal gas equation

    that is PV = nRT

    P=745 mm hg

    V = ?

    R (gas constant) = 62.36 L. mm hg/mol. k

    T = 20 + 273 = 293 k

    n=number of moles which is calculated as follows

    find the moles of Na used

    = 0.52/23=0.023 moles

    write the reacting equation

    2Na + 2H2O = 2NaOH + H2

    by use of reacting ratio between Na : H2 which is 2:1 therefore the mole of H2 = 0.023/2 = 0.0115 moles

    by making the volume the subject of the formula

    v=nRT/P

    V = (0.0115 x 62.36 x 293) / 745 = 0.283 L
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