A fast-food item contains 544 nutritional calories. How do you convert this energy to joules?

1 Answer
Jun 11, 2016

Answer:

By using the conversion factor of 4.184 Joules per calorie.

Explanation:

It is important to realize that when the term 'nutritional calorie' is used, they mean kilocalorie (= #1000# calories).

It is known that 1 calorie is approximately #4.184# Joules.

This means that 1 kilocalorie = #1000*4.184# Joules = #4184# Joules

Your fast-food item contains 544 kilocalories which compares to: #554 * 4184# = #2317936# Joule = #2.32 * 10^6# Joule

Note that the exact conversion factor for calories to Joules depends on temperature and atmospheric pressure