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250g of lead at 170oC is dropped into 100g of water at 0oC. If the...

Physics
JAMB 1982
250g of lead at 170oC is dropped into 100g of water at 0oC. If the final temperature is 12oC, the specific heat of lead is (specific heat of water is 4,200J/kgoC)
  • A. 39.5J/kgoC
  • B. 50.4J/kgoC
  • C. 127.6J/kgoC
  • D. 154.6J/kgoC
  • E. 173.4J/kgoC
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Correct Answer: Option C
Explanation
Heat lost = heat gained

0.25 x C1 x (170 - 12) = 0.1 x 4200 x (12 - 0)

C1 = 127.6J/kgoC
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WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
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