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

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

Correct answer is C

Heat lost = heat gained

m x (80 - θ) x 1.5 = m x (θ - 20) x 1

θ = 56oC