A2in. piece of chocolate cake with frosting provides 1670 kj of energy. what is this in dietary calories(cal)

399.1 dietary calories

Explanation:

A 2in. piece of chocolate cake with frosting provides 1670 kJ (1670 × 10³ J) of energy. We can express this in calories, knowing that 1 cal = 4.184 J.

1670 × 10³ J × (1 cal/4.184 J) = 3.991 × 10⁵ cal

The dietary calorie is an energy unit commonly used to describe the energy content of foods and 1 dietary calorie = 1 kcal = 10³ cal. The energy in dietary calories corresponding to 3.991 × 10⁵ calories is:

3.991 × 10⁵ cal × (1 dietary calory/ 10³ cal) = 399.1 dietary calory