Main Answer
When 8 moles of CaCO₃ are heated, 6 moles of CaO can be obtained.The option C is correct.
Explanation
The chemical equation for this reaction is:
CaCO₃ (s) → CaO (s) + CO₂ (g)
In this reaction, 1 mole of CaCO₃ produces 1 mole of CaO and 1 mole of CO₂. Therefore, to find the number of moles of CaO produced when 8 moles of CaCO₃ are heated, we can set up a mole ratio:
Moles of CaO = Moles of CaCO₃ x Moles of CaO per mole of CaCO₃ = 8 moles x (1 mole)/(1 mole) = 8 moles
Now that we know the number of moles of CaO produced, we can find the mass of CaO using its molecular mass (56 g/mol):
Mass of CaO = Moles of CaO x Molar mass = (6 moles) x (56 g/mol) = approximately 336 grams
Therefore, when 8 moles of CaCO₃ are heated, approximately 336 grams of CaO can be obtained.The option C is correct.