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    Molality and Molarity Questions

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    Question #1: For the reaction:
    2 Al + 6 HBr (aq) ---> 3H2 + 2 AlBr3
    What volume of 0.300 M HBr(aq) is needed to react with 22.6 g of AL?

    Question #2: The density of a 3.92 M solution of NaCl in water is 1.148 g/cm^3 at 20 degrees celcius. Find the molality (not molarity) of this solution.

    © BrainMass Inc. brainmass.com October 10, 2019, 6:23 am ad1c9bdddf
    https://brainmass.com/chemistry/stoichiometry/molality-molarity-questions-542318

    Solution Preview

    Q 1: 1 mole of HBr == 79.9+1 = 80.9 gm
    1 mole of Al == 26.98 gm

    2 moles of Al == 6 moles of HBr
    => 2*26.98 gm Al == 6 moles of HBr
    => 22.6 gm Al == 6*22.6/(2*26.98) = 2.513 mole of HBr

    0.3M ...

    Solution Summary

    A question is solved to find volume of a solution of given molarity while reacting with the other element of given quantity. The other problem solves for estimating molality of given solution.

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