# Energy Conversion: Snack Bar Calories to Joules

## How many joules are there in a 255 calorie snack bar?

a. 1.07 × 10⁶

b. 1.07 × 10³

c. 2.55 × 10⁵

d. 6.09 × 10⁴

e. None of the above

Final answer: A

## Answer:

A 255 calorie snack bar corresponds to approximately 1.07 × 10³ joules, using the conversion rate of 4.18 joules per calorie.

Wow, did you know that a 255 calorie snack bar is equivalent to approximately 1.07 × 10³ joules? That's a lot of energy packed into a small package! The conversion rate of 4.18 joules per calorie allows us to calculate this conversion easily.

To convert calories to joules, we simply multiply the number of calories by the conversion factor of 4.18 joules per calorie. So for a 255 calorie snack bar:

255 calories * 4.18 joules/calorie = 1065.9 joules

This result is approximately equal to 1.07 × 10³ joules. Therefore, the correct answer is b. 1.07 × 10³ joules. It's amazing to see how energy can be quantified and converted between different units!