Question

Barium sulfate, BaSO4, is a white crystalline solid that is insoluble in water. It is used by doctors to diagnose problems with the digestive system. Barium hydroxide, Ba(OH)2, is also a white crystalline solid and is used in wastewater and treatment. How many more oxygen atoms are represented in the formula for barium sulfate than in the formula for barium hydroxide?
BaSO4 has 4 oxygen atoms per mol BaSO4.
Ba(OH)2 has 2 oxygen atoms per mol Ba(OH)2.

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