# An exothermic reaction releases 80.5 J of energy. How many calories of energy are released in the reaction?

##### 1 Answer

Apr 29, 2016

19.2 Joule

#### Explanation:

In order to solve this we should know how many calories makes a joule.

1 calorie = 4.184 Joules

we can write two conversion factors using the above equation;

1 calorie / 4.184 Joules and 4.184 Joule/ 1 calorie

80.5 calorie x ( 4.184 Joule / 1 calorie)

19.2 Joule.