A sample of C7H5N3O4 has a mass of 7.81 g. What is the mass of oxygen in this sample? Hint: Use moles as an intermediary unit and focus on the ratio of how many oxygens there are per formula unit.
A) 31.2 g
B) 2.56 g
C) 3.20 × 1023 g
D) 64.0 g
E) 1.75 g
Correct Answer:
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