Question

4 .184J/( "C))intay at 20.0 °C. Aher the A mass of 42.5g of an unknown solid initially at 2000'C is added to an ideal constant-pressure calorimeter containing 100.0 g of water ( C mature reaches thermal equilibrium, the final temperature is recorded to be 25.40 "C. What is the specificheat capacity of the unknown Sold? Express your answer to three significant figures. View Available Hints) V AED RO? Submit Previous Answers

Answer 1

From law of conservation of energy,

heat lost by unknown solid = heat gained by water

         m1*s1*DT1 = m2*s2*DT2

m1 = mass of unknown solid = 42.5 g

s1 = specific heat of glass = x j/g.c

DT1 = (200-26.40) c

m2 = mass of water = 100 g

s2 = specific heat of water = 4.184 j/g.c

DT2 = (26.40-20) c

therefore, 42.5*x*(200-26.40) = 100*4.184*(26.40-20)

x = 0.3629 j/g.c

Therefore, specific heat of the unknown solid = 0.363 j/g.c