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A calorimeter cups weighs 15 grams and is made of aluminum. it is filled with 20 grams of water. 3 grams of unkown sustance is

A calorimeter cups weighs 15 grams and is made of aluminum. it is filled with 20 grams of water. 3 grams of unkown sustance is heated to 100 degrees C in boiling water and dropped into the cup. The system is allowed to cool and reaches a final temperature of 28 degrees C. Its initial temperature is 21 degrees C. 

What is the specific heat capacity of the unknown substances?

Cal=9X10^2 J/kg C degrees

C water=4186 J/kg C degrees

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