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find the volume of CO2 gas liberated at STP by thermal decomposition of 1 ton of 90% pure limestone

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CaCO3 ==> CaO + CO2
Convert 1 ton to grams. 2000 lbs x 454.6 g/lb = ?
mols CaCO3 = grams/molar mass CaCO3
Every mole CaCO3 will release 22.4 L CO2 so mols CaCO3 x 22.4 L/mol = ?

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