Question 1 Calculate the change internal energy (E) for a system that is giving

Question

Question 1

Calculate the change internal energy (E) for a system that is giving off 25.0 kJ of heat and is performing 975 J of work on the surroundings.

Question 5

A gas cylinder contains 10.0 moles of C3H8 (propane) gas. Calculate the heat associated with the complete combustion of all of the propane in the cylinder.

C3H8(g) + 5O2(g) 3CO2(g) + 4H2O(g) Hrxn = -2044 kJ

Question 13

Calculate the change in internal energy (E) for a system that is absorbing 35.8 kJ of heat and is expanding from 5.00 to 24.0 L in volume at 1.00 atm. (Remember that 101.3 J = 1 Latm)

Question 14

Acid-base reaction is a neutralization reaction. If 16.50 mL of 1.25 M NaOH solution is used to neutralize 45.00 mL of HCl solution, calculate the concentration of the original HCl solution.

   NaOH(aq) + HCl (aq) NaCl(aq) + H2O(l)

Explanation / Answer

1.

Calculate the change internal energy (E) for a system that is giving off 25.0 kJ of heat and is performing 975 J of work on the surroundings.

Apply first law of thermodynamics

so

dE = Q - W

Q = -25 kJ (since it is giving it)

W = 975 J (since it is done)

so

W = 0.975 kJ

dE = -25 -0.975 = -25.975 kJ

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