To calculate the number of calories needed to raise the temperature of 1 gram of water by 72 degrees Celsius, we can use the specific heat of water.
The specific heat of water tells us that 1 gram of water requires 1 calorie of energy to change its temperature by 1 degree Celsius. Since we want to increase the temperature by 72 degrees, we multiply the calories required for 1 degree by the number of degrees we want to raise the temperature.
So, we have:
Calories required = Specific Heat × Temperature Change
Calories required = 1 calorie/°C × 72 °C = 72 calories
Therefore, it takes 72 calories to raise the temperature of 1 gram of water by 72 degrees Celsius.