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5 questions
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  • Q1
    What is the percent by mass of magnesium in MgO (molar mass of MgO = 40.3 g/mol)?
    60%
    50%
    20%
    40%
    30s
    112.35.c.8.c
  • Q2
    What is the percent composition by mass of sulfur in the compound MgSO4 (molar mass of MgSO4 = 120 g/mol)?
    53%
    46%
    27%
    20%
    30s
    112.35.c.8.c
  • Q3
    What is the percent by mass of calcium in CaF2 (molar mass = 78 g/mol)?
    24%
    49%
    51%
    65%
    30s
    112.35.c.8.c
  • Q4
    What is the percent by mass of Carbon in sugar C12H22O11 ?
    14%
    12%
    34%
    42%
    30s
    112.35.c.8.c
  • Q5
    What is the percent by mass of Oxygen in water? H2O.
    11%
    50%
    33%
    89%
    30s
    112.35.c.8.c

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