To calculate the amount of heat required to raise the temperature of a substance, you can use the formula:
Q = m * c * ΔT
Where: Q is the amount of heat energy m is the mass of the substance c is the specific heat capacity of the substance ΔT is the change in temperature
For water, the specific heat capacity (c) is approximately 4.18 Joules per gram per degree Celsius (J/g°C).
Given: m = 100 g (mass of water) ΔT = 40°C - 20°C = 20°C (change in temperature)
Plugging these values into the formula:
Q = 100 g * 4.18 J/g°C * 20°C
Q = 83,600 Joules
Therefore, the amount of heat required to raise the temperature of 100g of water by 20°C is 83,600 Joules.