one cup of popcorn that produces 123 kJ when burned in a calorimeter
To calculate the number of calories in one cup of popcorn, we need to convert kilojoules (kJ) to calories (cal).
1 calorie (cal) = 4.184 kilojoules (kJ)
So, in this case, 123 kJ = (123 * 4.184) cal = 514.232 cal
Therefore, one cup of popcorn produces approximately 514.232 calories when burned in a calorimeter.
To find the energy content of one cup of popcorn, we can divide the total energy (123 kJ) by the number of cups. However, we need to convert kilojoules (kJ) to calories (cal) first since the energy content of food is commonly measured in calories.
1 calorie is equivalent to 4.184 kilojoules, so to convert kJ to cal, we can use the conversion factor:
123 kJ * (1 cal / 4.184 kJ) = approximately 29.43 cal
Therefore, one cup of popcorn has an energy content of approximately 29.43 calories when burned in a calorimeter.