Energy in Food

Part of the Food Chemistry and the Lab section of Coddy's Chemistry journey. Lesson 13 of 27.

A food label gives energy in kJ. Per gram: fat $37\ \mathrm{kJ/g}$ , carbohydrate and protein $17\ \mathrm{kJ/g}$ .

$E = m \times e$

Burning food under water measures its energy. The water takes in $q = m \cdot c \cdot \Delta T$ , with c = $4.18\ \mathrm{J/(g·K)}$ for water.

Challenge

A handful of nuts holds $15\ \mathrm{g}$ of fat. Fat gives $37\ \mathrm{kJ/g}$ . How much energy E does the fat give?

Try it yourself

Solve for $E$

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Food Chemistry and the Lab

1Carbohydrates

4Food Energy and Additives

7Practice Problems

2Fats and Oils

5Laboratory Skills

3Proteins

6Experiments