Practice question
Question
In 2Cu + O₂ -> 2CuO, how many grams of O₂ are needed to oxidize 127 g of Cu? (Atomic masses: Cu = 63.5, O = 16)
Explanation
Given:
In 2Cu + O₂ -> 2CuO, how many grams of O₂ are needed to oxidize 127 g of Cu? (Atomic masses: Cu = 63.5, O = 16)
These values define the system as per NCERT data.
Formula:
Moles of Cu = 127 / 63.5 = 2.
This is standard NCERT relation.
Substitution & Calculation:
2 moles Cu need 1 mole O₂ (32 g). Thus, 32 g.
Result:
The computed value matches expected outcome and confirms correct choice as per NCERT.
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