How much energy is released when 20.0 g of water is cooled from 50°c to 30°c (cwater= 4.18 j/ g*°c)

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 .

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conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.