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6 February, 10:18

A chemist adds of a M zinc nitrate solution to a reaction flask. Calculate the mass in grams of zinc nitrate the chemist has added to the flask. Round your answer to significant digits.

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  1. 6 February, 13:14
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    corrected question: A chemist adds 135mL of a 0.21M zinc nitrate solution to a reaction flask. Calculate the mass in grams of zinc nitrate the chemist has added to the flask. Round your answer to significant digits.

    Answer:

    5.37g

    Explanation:

    0.21M means; 0.21mol/dm³

    1dm³=1L, so we can say 0.21mol/L

    if 0.21mol of Zinc nitrate is contained in 1L of water

    x will be contained in 135mL of water

    x = 0.21*135*10³/1

    =0.02835moles

    number of moles = mass / molar mass

    mass = number of moles * molar mas

    molar mass of Zn (NO₃) ₂=189.36 g/mol

    mass = 0.02835 * 189.36

    mass=5.37g
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