1. A reaction in aqueous solution is run in a calorimeter and it is found that t

Question

1. A reaction in aqueous solution is run in a calorimeter and it is found that the the solution gains 99 kJ of heat and the calorimeter gains 5 kJ of heat. What is the heat gained or lost by the reaction (qrxn) in kJ? (If it is negative, include the negative sign. If it is positive, include nothing)  

2. In a reaction of a potential new fuel, it is found that when 2.84 moles of the fuel combusts, 1,625 kJ of energy is released. What is the delta Hrxn for the combustion of the fuel in units of kJ/mol.  (If it is negative, include the negative sign. If it is positive, include nothing)

3. The Hrxn for the reaction A + B C is 17 kJ.

What is Hrxn for the reaction 3A + 3B 3C in kJ?

4. The Hrxn for the reaction A + B C is 12 kJ.

What is Hrxn for the reaction 4C - 4A + 4B in kJ?

Explanation / Answer

1.the reaction is exothermic leading to gain of heat by solution and water

This much heat is to be lost by the reaction = - ( total of heat gained)= 99+5= -104 Kj

2 it is given that 2.84 moles of fuel gives 1625 Kj

heat of reaction = -1625/2.84 Kj/mole . =-572.2 Kj/mole

3. A+B----->C, deltaH= 17 Kj

multiplying with 3, 3A+3B------>3C, deltaH= 3*17= 51Kj

4. A+B->c, heat of reaction =12 Kj

multiplying with 4, 4A+4B----->4C, heat of reaction = 4*12= 48 KJ

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