0.7 g 9.3 g 10.0 g 19.3 g
I gave my students this multiple choice question: When heated, mercuric oxide decomposes to form liquid mercury and oxygen. A scientist heated 10 grams (g) of mercuric oxide and formed 9.3 grams of liquid mercury. How many grams of oxygen were formed?

Only one answer is correct among these 4 choices:
- 0.7 g
- 9.3 g
- 10.0 g
- 19.3 g

Could you tell me which one is correct?

0.7 g