How much heat in kcal must be added to 0.77 kg of water at room temperature (20°C) to raise its temperature to 50°C?

Answer 1

q = mass H2O x specific heat H2O x (Tfinal-Tinitial)
mass H2O = 1000 g
specific heat H2O = 1 cal/g*c
Tfinal = 50
Tinitial = 20