please use
[tex]H=mC\Delta T[/tex]here m = mass = 2.26 grams\
C = specific heat capacity of water that is 4.2 j / g C
delta T is the difference in temperature.
H = 2.26 * 4.2 * (50 - 25)
H = 237.3 J
so the answer is,
the energy needed is 237.3 Joule or 237.3 J
