Question

what is the heat energy required for water of mass 4kg at 100°c for complete evaporation? and also answer 8th question in the picture.

Answer 1

Ans 8:
The reaction is endothermic

Mass =4kg
Temperature =100°C=100K
specific heat capacity of water =4200jkg^-1K^-1
Heat required =mct
=4*100*4200
=16.8*10^5 J