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8 April, 23:25

How many moles are in 128.9 grams of Cr2 (SO3) 2?

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  1. 8 April, 23:30
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    Answer: 0.5 moles

    Explanation:

    Cr2 (SO3) 2 is the chemical formula for chromium sulphate.

    Given that,

    Amount of moles of Cr2 (SO3) 2 (n) = ?

    Mass of Cr2 (SO3) 2 in grams = 128.9g

    For molar mass of Cr2 (SO3) 2, use the atomic masses:

    Chromium, Cr = 52g;

    Sulphur, S = 32g;

    Oxygen, O = 16g

    Cr2 (SO3) 2 =

    (52g x 2) + [ (32g + 16g x 3) x 2]

    = 104g + [ (32g + 48g) x 2]

    = 104g + [80g x 2]

    = 104g + 160g

    = 264g/mol

    Since, n = mass in grams / molar mass

    n = 128.9g / 264g/mol

    n = 0.488 mole [Round the value of n to the nearest tenth which is 0.5

    Thus, there are 0.5 moles in 128.9 grams of Cr2 (SO3) 2
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