Respuesta :

Answer:

1672 J

Explanation:

We are supposed to find out the energy released by water when cooled from 50° C to  30°C .

We have the relation that ,

H=msΔT

Information is given that s=4.18 J/ g*°C ,

m=20.0 g,

and ΔT is -20° C.

Hence by substituting we get,

H=-20*20*4.18

(minus symbol represents that energy is being released)

1672 J is release when water is cooled from 50° C to  30°C .