Answer to Question #110610 in Chemistry for Wyatt Barr

Question

Calculate the amount of heat released when one bottle (250g) of water is cooled from 30 degrees celcius to 25 degrees celciuis. The specific heat of water is (-4.186J/g degress celcius-).

Answer 1

Solution:

To calculate the amount of heat entering or leaving a system, the equation Q = mcΔT is used.

m = mass (in grams)

c = specific heat capacity (J/g°C)

ΔT = change in temperature (°C).

ΔT = (T_final - T_initial) = 25°C - 30°C = -5°C

Then,

Q = mcΔT = (250 g) * (4.186 J/g°C) * (-5°C) = -5232.5 J.

Q = -5232.5J.

The negative Joule value means heat is being lost in an exothermic reaction.

Answer: Q = -5232.5J.