a.) How much energy is needed to heat 20.0mL of water from room temperature to 40.0°C?

Question

b.) How much energy is released when 20.0mL of water is cooled from initial temperature to 10.0°C?

Answer 1

a. Q=mc*deltaTemp=20g*4.186j/g*(40-room temp)
you get to decide what room temp means. It is different for Moscow and Panama City.
b. same formula.

Answer 2

I could be mistaken, but I was taught to believe that room temperature as 25° C.