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27 September, 10:57

What mass of hydrogen is produced from 5.71 mol of aluminum?

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Answers (1)
  1. 27 September, 11:14
    0
    3.03 g

    Explanation:

    The first thing to do here is figure out the chemical formula for aluminium hydroxide.

    Aluminium is located in group

    13

    of the periodic table, and forms

    3

    +

    cations,

    Al

    3

    +

    . The hydroxide anion,

    OH

    -

    , carries a

    1

    -

    charge, which means that a formula unit of aluminium hydroxide will look like this

    [

    Al

    3

    +

    ]

    +

    3

    [

    OH

    -

    ]



    Al

    (

    OH

    )

    3

    Now, you can figure out the mass of hydrogen present in

    1

    mole of aluminium hydroxide by first determining how many moles if hydrogen you get in

    1

    mole of aluminium hydroxide.

    Since

    1

    mole of aluminium hydroxide contains

    3

    moles of hydroxide anions, which in turn contain

    1

    mole of hydrogen each, you can say that you will have

    1 mole Al

    (

    OH

    )

    3



    3

    a

    moles OH

    -



    3

    a

    moles H

    The problem tells you that the molar mass of hydrogen is equal to

    1.01 g mol

    -

    1

    . This means that

    1

    mole of hydrogen has a mass of

    1.01 g

    .

    You can thus say that one mole of aluminium hydroxide contains

    3

    moles H



    1.01 g

    1

    mole H

    =

    a

    a

    3.03 g H

    a

    a





    I'll leave the answer rounded to three sig figs. Btw my sister calculated this oof
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