Final answer:
To raise the temperature of 100g of water from 20°C to 70°C, 20900 J of heat is required.
Step-by-step explanation:
To calculate the amount of heat required to raise the temperature of water, we need to use the specific heat formula:
q = m * c * ΔT
Where:
- q is the heat energy
- m is the mass of the water (100 g)
- c is the specific heat capacity of water (4.18 J/g·°C)
- ΔT is the change in temperature (70°C - 20°C = 50°C)
Plugging in the values, we get:
q = 100 g * 4.18 J/g·°C * 50°C
q = 20900 J
Therefore, 20900 J of heat is required to raise the temperature of 100 g of water from 20°C to 70°C.