Answer:
The final temperature of the water is 25.6 °C.
Step-by-step explanation:
We have,
Heat added to water is 135.7 J
Mass, m = 54 g
Initial temperature was 25 °C
It is required to find the final temperature of the water. The heat added when temperature is increased is given in terms of specific heat capacity as :

is final temperature
c is specific heat capacity, for water,

So,

So, the final temperature of the water is 25.6 °C.