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.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer