What energy is needed to raise the temperature of 2 kg of water from 20 ºc to 100 ºc. the heat capacity of water is 4190 j /kg/ ºc.

670400 J

Explanation:

m = mass of water = 2 kg

T₀ = initial temperature of water = 20 ºC

T = initial temperature of water = 100 ºC

c = heat capacity of water = 4190 J /kg ºC

Q = energy needed to raise the temperature of water

Energy needed to raise the temperature of water is given as

Q = m c (T - T₀)

Inserting the values

Q = (2) (4190) (100 - 20)

Q = 670400 J

i think the answer is a, hope this is right, that would be my best guess.