What percentage mass of magnesium oxide is magnesium?

A student found that 0.300g of magnesium combined with oxygen to form 0.497g of magnesium oxide. What is the mass percentage composition of?

  • Answer:

    Since the total mass is .300 + .497 = .797 grams, the percentage of magnesium is .300 / .797 x 100 = 37.6%. The percentage of oxygen is .497 / .797 x 100 = 62.4%

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