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What quantity of copper will be deposited by the same quantity of electricity that deposited...

Chemistry
WAEC 1989

What quantity of copper will be deposited by the same quantity of electricity that deposited 9.0g of aluminum? (A = 27, Cu = 64)

  • A. 64g
  • B. 32g
  • C. 7.1g
  • D. 6.4g
  • E. 3.2g
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Correct Answer: Option B
Explanation

Al has valency of 3+:

3F will deposit 27g

xF will deposit 9g

cross multiply → \(\frac{9g * 3F}{27g}\)

: 1F = 9g

Cu has valency of 2+:

2F will deposit 64g

1F will deposit xg

cross multiply → \(\frac{64g * 1F}{2F}\)

: 1F = 32g

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