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Science, Chemistry

9th -

12thgrade

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Moles Test Review

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12 questions

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  • 1. Fill in the Blank
    3 minutes
    1 pt

    A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula? (No spaces)

  • 2. Multiple Choice
    2 minutes
    1 pt

    How many atoms of Na make up 5.17 moles of Na?

    3.1 x 1024 atoms

    6.02 x 1024 atoms

    1.2 x 1024 atoms

    2.4 x 1024 atoms

  • 3. Multiple Choice
    15 minutes
    1 pt

    Find the percentage composition of P in Mg3(PO4)2.

    27.74% P

    23.57% P

    43.62% P

    12.63% P

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