An unknown metal of mass 192 g heated to a temperature of 100
o
C was immersed into a brass calorimeter of mass 128 g containing 240 g of water at a temperature of 8.4
o
C. Calculate the specific heat of the unknown metal if water temperature stabilizes at 21.5
o
C. (Specific heat of brass is 394 J kg
–1
K
–1
)