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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

32 g

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B

12 g

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C

44 g

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D

48 g

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Solution

The correct option is C

44 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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