How much heat is released when 75 g of octane is burned completely if the enthalpy of combustion is -5,500 kj/mol csh18? c8h18 + 25/2 o2 o 8co2 + 9h20 e. 5500 kj a. 7200 kj b. 8360 kj c. 4.1 x 105 kj d. 3600 kj

Answer : The correct option is, (D) 3600 kJ

Explanation :

Mass of octane = 75 g

Molar mass of octane = 114.23 g/mole

Enthalpy of combustion = -5500 kJ/mol

First we have to calculate the moles of octane.

Now we have to calculate the heat released in the reaction.

As, 1 mole of octane released heat = -5500 kJ

So, 0.656 mole of octane released heat = 0.656 × (-5500 kJ)

                                                                   = -3608 kJ

                                                                   ≈ -3600 kJ

Therefore, the heat released in the reaction is 3600 kJ

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