An exothermic reaction releases 13,450J of heat. How many calories of energy are released? A) 5 56,274 calories B)1,244 caloriesC) 134,500 caloriesD) 3,215 calories

The correct option is;

D) 3,215 calories

Explanation:

Here we are required to convert 13,450 J to calories

1 calorie is the amount of heat required to raise the temperature of 1 gram of water by 1°C

Therefore, 1 calorie = 4.184 Joules

Hence, 1 Joule = 1/4.184 calorie for which we have;

13,450 J = 13,450 × 1/4.184 calories = 13,450/4.184 calorie

13,450 J = 3,214.63 calories

Rounding up to the nearest  whole number, we have;

13,450 J ≈ 3,215 calories.

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.