We can use the heat
equation,
Q = mcΔT
Where Q is the amount of energy transferred (J), m is
the mass of the substance (kg), c is the specific heat (J g⁻¹ °C⁻¹) and ΔT is the temperature
difference (°C).
Q = ?
m = 100.0 g
c = 4.18 J/g°c
ΔT = (37 - 4) °C = 33 °C
By applying the
formula,
Q = 100.0 g x 4.18 J/g °C x 33°C
Q = 13794 J
Hence, needed energy is 13794 J.
