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Two liquids, P at a temperature of 20oC and Q at a temperature of 80oC...

Physics
JAMB 1985
Two liquids, P at a temperature of 20oC and Q at a temperature of 80oC have specific heat capacities of 1.0Jkg-1oC-1 and 1.5J kg-1 oC-1respectively. if equal masses of P and Q are mixed in a lagged calorimeter, then the equilibrium temperature is
  • A. 44oC
  • B. 50oC
  • C. 56oC
  • D. 60oC
  • E. 70oC
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Correct Answer: Option C
Explanation
Heat lost = heat gained

m x (80 - \(\theta\)) x 1.5 = m x (\(\theta\) - 20) x 1

\(\theta\) = 56oC
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