How much energy would be absorbed or released by the h2o in the process 30 grams h2o (

g. at 100◦c → 30 grams h2o (ℓ) at 20◦c?

Speicific heat of water is 4.2j/gm*C

Thus 4.2 Joules of energy is required to heat 1 gm water to 1*C.

or 4.2 x 30 Joules enery is required to heat 1x30 gm water by 1*C

or 4.2 x 30 x 80 Joules enery is required to heat 1 x 30 gm water by (100-20) * C (or required to be removed from water to cool it)