A box of graham crackers is labeled "120 Calories per serving." Assuming this means 120 kcal, and recalling that 4.16 J = 1 cal, the energy of a serving of the graham crackers is about A) 5$\times$ 10⁵ J. B) 5$\times$ 10⁴ J. C) 4.2$\times$ 10³ J. D) 120 J.

Question

Quizplus · Accepted Answer

120 kcal is equivalent to 120,000 cal. Since 1 cal = 4.16 J, the energy in joules is 120,000 cal $\times$ 4.16 J/cal = 499,200 J, which is approximately 5$\times$ 10⁵ J.

A Box of Graham Crackers Is Labeled "120 Calories Per ×\times×

A Box of Graham Crackers Is Labeled "120 Calories Per $\times$