How much heat is released as the temperature of 25.2 grams of iron is decreased from 72.1°C to 9.8°C? The specific heat of iron is 0.444 J/g·°C.

Negative sign says that release of heat.

Explanation:

The expression for the calculation of the heat released or absorbed of a process is shown below as:-

Where,  

 is the heat released or absorbed

m is the mass

C is the specific heat capacity

 is the temperature change

Thus, given that:-

Mass = 25.2 g

Specific heat = 0.444 J/g°C

So,  

Negative sign says that release of heat.

its first and third is your answer i did the qustion the fourth isnt right

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error