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    Malott21's Avatar
    Malott21 Posts: 1, Reputation: 1
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    #1

    Feb 21, 2010, 09:35 PM
    What is the total mass of a mixture of 1.5 X 10^23 formula units Na2So4, 0.132 mol H2
    I Don't know what to do.. I need like all the work and answer. Just to like have an example
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Feb 22, 2010, 07:55 AM

    One mole of a substance has a mass equal to the relative mass of the substance.

    Eg.
    1 mole of H2 gas has a mass of 2 g (relative mass of 2 H = 2)
    1 mole of O2 gas has a mass of 32 g (relative mass of 2 O = 32)

    Also, one mole of a substance contains the Avogadro's constant number of particles.
    1 mole of H2 gas contains 6.02x10^23 molecules of H2.
    1 mole of O2 gas contains 6.02x10^23 molecules of O2.

    Try your problem now. You only need to use proportions. Post your answer!

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