2. When 1.00 L of 1.00 M Ba(NOg)z solution at 25.0 C is mixed with 1.00 L of 1.0

Question

2. When 1.00 L of 1.00 M Ba(NOg)z solution at 25.0 C is mixed with 1.00 L of 1.00 M Na,SO4 solution at 25.0°C in a calorimeter, the white solid Ba mixture increases to 28.1°C. Assuming that t heat, that the specific heat capacity of the solution is 4.18 J/C.g, and that the density of the final solution is 1.0 g/mL, calculate the enthalpy change per mole of BasO, formed. SO4 forms, and the temperature of the he calorimeter absorbs only a negligible quantity of - 3. A balloon is being inflated to its full extent by heating the air inside it. In the final stages of this process, the volume of the balloon changes from 4.00 × 106 L to 4.50 x 106 L by the additio of 1.3 x 108 Jof energy as heat. Assuming that the balloon expands against a constant pressure of 1.0 atm, calculate E for the process. To convert between L-atm and J, use 1 L-atm = 101.3 J.

Explanation / Answer

W= -P*(V2-V1) = -1*(4.50*10^6-4.00*10^6) = -500000lit atm = -50650000joules

ACCORDING TO THE FIRST LAW OF THERMODYANAMICS

DU= Q+W

     =1.3*10^8-50650000

      =79350000JOULES

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