Calculate the change internal energy (AE) for a system that is giving off 45.0 k

Question

Calculate the change internal energy (AE) for a system that is giving off 45.0 kl of heat and is performing 8551 of work on the surroundings 1. 2. required to raise the temperature of a 79.0 g sample of ethanol from 29SK to Calculate the amount of heat (in k 385.0 K. The specific heat capacity of ethanol is 2.42 1g'C A sample of 5.23 kg of aluminum absorbs heat, which raises the temperature 50.0C. Determine the amount of heat absorbed, in kJ, if the specific heat capacity of aluminum is 0.903 J/g'C. 3. What is the minimum energy required to decompose 765 g of PCl3. according to the reaction below? The molar mass of PCl3 is 137.32 g/mol and may be useful. 4. 4PCI3(g) P4(s) +6Cl2(g) AH rxn- +1207 k) 5. How much energy is evolved during the formation of 98.7 g of Fe, according to the reaction below? Fe2O3(s) + 2 Al(s) Al2O3(s) +2 Fe(s) AHrxn 852 k 6. What volume of benzene (CsHs d-0.88 g/ml, molar mas -78.11 g/mol) is required to produce 5x 103 kJ of heat according to the following reaction? 2C6H6() + 1502(g) 12CO2(g) + 6H20 g) AH'rxn--6278 kJ Using the following equation for the combustion of octane, calculate the heat of reaction for 100.0 g of octane. The molar mass of octane is 114.33 g/mole. 7. 2C8H18 + 2502 16CO2 + 18H20 AH'rxn--11018 k] 8. According to the following reaction, how much energy is evolved during the reaction of 2.50 L B2H6 and 5.65 L C12 (Both gases are initially at STP)? The molar mass of B2H6 is 27.67 g/mol. B2H6(g) + 6 Cl2(g) 2 Ba3(g) + 6 HCl(g) AH rxn -1396 k 9. Use the standard reaction enthalpies given below to determine AH'rn for the following reaction: P4(g) + 10 Cl2(g) 4PCl5(s) Given:

Explanation / Answer

Ans 1 :

The internal energy of the system is equal to the sum of heat of the sytem and work.

Since the heat is given off , so q = -45.0 KJ

work is done on the surrounding , so w = -855 J or 0.855 KJ

So the internal energy = -45.0 KJ + (-0.855 KJ)

= -45.855 KJ

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