Question

# In an experiment, the following reaction takes place. C(s)+O2(g)→CO2(g)12 g 32 g 44 g How much mass of carbon dioxide will be produced, when 12 g of carbon reacts with 48 g of oxygen?

A

14 g

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B

10 g

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C

8 g

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D

7 g

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Solution

## The correct option is C 8 g Elements always combine together in a constant ratio by mass to form a compound. 12 g of carbon reacts with 32 g of oxygen, so the mass ratio is 12:32 or 3:8. This means that carbon will always combine with oxygen in 3:8 by mass to form carbon dioxide. Hence, 12 g of carbon will combine with 32 g oxygen and produce 44 g of carbon dioxide. Therefore, in the given situation, 48-32 = 16 g of oxygen will be left unreacted.

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