To solve for the heat needed, use the equation:
Q= m x c x ΔT
Where:
Q is the heat needed
m is the mass of (block of) aluminum
c is the specific heat capacity of aluminum
ΔT is the change in temperature
Solution:
Q= m x c x ΔT
Q= (5g) x (0.902 J/g•°C) x (37.0°C - 22.0°C)
Q= (5g) x (0.902 J/g•°C) x (15°C)
Q= 67.65 J