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    Molarity, electron configuration, and concentration

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    Question 31
    What is the molarity of a solution in which 26.0 grams of BaCl2 (molar mass = 208.2 g/mol) are dissolved in enough water to make 450.0 mL of solution?
    0.278 M
    0.617 M
    1.00 M
    3.41 M

    Question 32
    Which element has the following electron configuration?
    1s22s22p63s2
    Na
    Mg
    Al
    Si
    Ne

    Question 33
    Calculate the pH of beer in which the hydrogen ion concentration is 6.3 - 10-5 M
    4.2
    4.8
    5.63
    9.8
    14.0

    Question 34
    Which of the following is a physical change?
    water heated into steam
    apples turning brown when exposed to air
    milk turning sour
    bleach removing color from fabric

    Question 35
    Which of the following scientists developed the nuclear model of the atom?
    John Dalton
    Robert Millikan
    J. J. Thomson
    Henry Moseley
    Ernest Rutherford

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    https://brainmass.com/chemistry/acids-and-bases/molarity-electron-configuration-concentration-39901

    Solution Preview

    1) 0.278 M
    moles = mass / molar mass
    = 26 g / 208.2 g/mol
    = 0.12488 moles
    ...

    Solution Summary

    This solution provides the answer to each question along with a brief calculation and/or explanation for this answer.

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