Question

Calculate the heat change associated
with cooling a 350.0 g aluminum bar
from 70.0/C to 25.0/C. Is the change
endothermic or exothermic? Why?
(-14.2 kJ)

Answer 1

Answer:

Heat change is -14,175 joules, Exothermic

Explanation:

We are given;

• Mass of aluminium bar as 350.0 g
• initial temperature as 70.0 °C
• Final temperature as 25 °C

We are required to determine the heat change and indicate whether endothermic or exothermic;

We know that;

Heat change = Mass of a substance × specific heat × change in temperature

In this case;

Mass of Aluminium = 350.0 g

Change in temperature = (25 - 70)

                                       = -45° C

Specific heat of aluminium = 0.90 J/g°C

Therefore;

Heat change = 350.0 g × 0.90 J/g°C × -45°C

                     =-14,175 joules

The heat change is exothermic because it is a negative value, also because cooling process involves heat loss and thus an exothermic reaction.