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?
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?
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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.
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.