125.0 g of an unknown substance is heated to 97.0°c. it is then placed in a calorimeter than contains 250g of water with an initial temperature of 20.0°c.
the final temperature reached by the calorimeter is 23.5°c.
what is the specific heat of the unknown substance? the specific heat of water is 4.18 j/ (°c × g)

a) 0.285 j/ (°c × g)
b) 0.398 j/ (°c × g)
c) 0.729 j/ (°c × g)
d) 1.24 j/ (°c × g)