How many grams of sulfur are in 164 g of potassium sulfate?
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We have to convert 2100 kilojoule into calories.
2100 Kilojoule is equal to 500 Calories.
The chemical reaction gives off 2100 Kilojoule of heat energy which indicates that the reaction is exothermic in nature. Calorie and Kilojoule both are units of energy. We know, 1 calorie=4.2 kilojoule= 4.2 KJ. So 4.2 KJ is equal to 1 Calorie i.e, 4.2 KJ= 1 Calorie. So, to convert KJ to calorie, we have to divide the energy given in KJ by quantity 4.2. Hence, 2100 Kilojoule energy is equal to Calorie= 500 Calories.