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Sagot :
Answer:
The amount in grams of CaO that will be produced is 2,302.67824 grams
Explanation:
The reaction between calcium and oxygen to produce calcium oxide (quicklime) can be presented as follows;
2Ca (s) + O₂ (g) → 2CaO (s)
From the above chemical equation, we have;
2 moles of calcium, Ca, react with 1 mole of oxygen gas, O₂, to produce 2 moles of CaO
With the assumption that there is an excess amount of Ca, we have;
The molar mass of O₂ = 32 g/mol
The number of moles, 'n', of O₂ in 657.0 grams of oxygen is therefore;
The number of moles of a substance = Mass of substance/(Molar mass of substance)
∴ n = 657.0 g/(32 g/mol) = 20.53125 moles
The number of moles of O₂ in the 657.0 grams of oxygen present in the reaction, n = 20.53125 moles
1 mole of O₂ produces 2 moles of CaO, therefore, 20.53125 moles of oxygen will produce 2 × 20.53125 or 41.0625 moles of CaO
The molar mass of CaO = 56.0774 g/mol
Therefore, the mass of 41.0625 moles of CaO is given as follows;
Mass of substance = (The number of moles of a substance) × (Molar mass of substance)
The mass of CaO produced = 41.0625 moles × 56.0774 g/mol = 2,302.67824 g.
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