Answer: 2,090J
The equation to find the specific heat is determined by the equation q = mcΔT, where q = total heat, m=mass, c = specific heat, and ∆T change in temperature.
Recall that the specific heat capacity for water is 4.18J/gºC
So, plug this along with your specific values into the equation.
q = 100g * (4.18J/gºC) * (20.0ºC-15.0ºC)
q = 2090J