Question

determine the kilocalories in one can of cola if it has 30 g of carbohydrate and no fat or protein. express your answer to two significant figures and include the appropriate units.

Explanation:

Step1: Recall calorie - per - gram value

Carbohydrates provide 4 kcal/g.

Step2: Calculate kilocalories

Multiply the mass of carbohydrate by the calorie - per - gram value. So, $30\ g\times4\ kcal/g = 120\ kcal$.

Step3: Round to two significant figures

Rounding 120 kcal to two significant figures gives 120 kcal (since 120 is already in two - significant - figure form in this context).

Answer:

120 kcal