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5 November, 07:31

What is the percent by mass of oxygen in Ca (OH) 2?

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  1. 5 November, 08:03
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    The answer to your question is Percent by mass = 43.2

    Explanation:

    Data

    Ca (OH) ₂

    Percent by mass of Oxygen = ?

    Process

    1. - Calculate the molecular mass of Ca (OH) ₂

    Ca (OH) ₂ = (40 x 1) + (16 x 2) + (2 x 1)

    = 40 + 32 + 2

    = 74 g

    2. - Calculate the mass of Oxygen = (16 x 2)

    = 32 g

    3. - Calculate the percent by mass

    Percent by mass = (mass of oxygen/mass of Ca (OH) ₂) x 100

    Percent by mass = (32/74) x 100

    Percent by mass = 43.2
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