First, we have to know that the heat released by the granite is equal to the heat absorbed by water.
Q released is negative because of the direction of the heat.
Next, we can use the equation we use for calorimetry:
A 13.0 g sample of granite initially at 82.0 oC is immersed into 26.0 g of water initially at 23.0 oC. What is the final temperature of both substances when they reach thermal equilibrium? (For water, Cp =4.18 J/g•oC and for granite, Cp =0.790 J/g•oC.)
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