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A student took a crucible and lid from the drawer, added 0.257 grams of magnesium metal...

A student took a crucible and lid from the drawer, added 0.257 grams of magnesium metal to it, and heated it until completely ashen. She found the contents had added 0.128 grams of mass.

What is the Mass percent for oxygen in the compound after heating?

33.2%

50%

66.8%

What is the ideal mass percent for oxygen in MgO?

40.7%

50%

60.3%

Science   Chemistry   
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