Chemistry
Grade-9
Easy
Question
The mass of carbon dioxide obtained when 2gm of pure limestone is heated:
- 0.2 gm
- 0.4 gm
- 0.44 gm
- 0.88 gm
Hint:
1 mole limestone gives 1 mole carbon dioxide.
The correct answer is: 0.88 gm
CaCO3 
CaO + CO2
1 mole limestone gives 1 mole carbon dioxide.
100g limestone gives 44g carbon dioxide.
2gm pure limestone gives 0.88gm carbon dioxide.
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