Calorific value of cow dung cakes is 7000 J/KG. How much cow dung cakes are required to produce heat energy of 35000 J ?
please answer to this question and its chemistry, COUMBUSTION AND FLAME.
We know that the amount of heat produced by the complete combustion of 1 KG of fuel is called its calorific vallue.It is expressed in "kilojoule per KG(KJ/KG)".
Since, 7000KJ of heat energy is produced in= 1 kg of fuel(cow dung cake)
So, 3500KJ of heat energy is produced in = 35000/7000=5 Kg of fuel(cow dung cakes)
Hope, it'll help you........
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35000/7000 = 5 kg cow dung