## Your Online "First Law of Thermodynamics" Teacher

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### Give the comparison of work of expansion of an ideal Gas and a van der Waals Gas.

We know that for an ideal gas, work done w is given as: Wideal = -nRT ln (V2/ V1) And for a a van der Waals Gas, work done is given as: Hence for the expansion of a gas, V2 > V1, which shows that numerically the work ...

### Numerical Problem

One mole of an ideal gas is heated at constant pressure from 0oC to 200oC. (a) Calculate work done. (b) If the gas were expanded isothermally & reversibly at 0°C from 1 atm to some other pressure Pt, what must be the final pressure if the maximum ...

### Calculate the final volume of one mole of an ideal gas initially at 0oC and 1 atm pressure. If it absorbs 2000 cal of heat during reversible isothermal expansion.

The gas is in the standard temperature and pressure condition i.e. at S.T.P Hence V1 = 22.4 dm3 and V2 have to be calculated. As given expansion is isothermal and reversible therefore, ∆U = 0 We know that ∆U = q + w But ∆U = 0 Hence q = ...

### Define Gibbs Free energy and hence Derive the Relationship between Equilibrium Constant and Gibbs free energy and hence Calculate ΔG o for conversion of oxygen to ozone 3/2 O2 (g) ——> O3 (g) at 300 K, if Kp for this conversion is 9.4710-29.

Gibbs free energy: It is the standard free energy which is equal to the difference in free energies of formation of the products and reactants both in their standard states. It is denoted by ΔGo. Relationship between Free Energy and Equilibrium Constant When equilibrium has not been attained, ...

### The molar heats of combustion of C2H2 (g), C (graphite) and H2 (g) are 210.62 Kcal, 84.05 Kcal and 69.32 Kcal respectively. Calculate the standard heat of formation of C2 H2 (g)

The required equation is 2C + H2 ----------> C2H5 Standard heat of formation i.e. ΔH ...

### In a certain process, 600 J of work is done on the system which gives off 250 J of heat. What is the change in internal energy for the process?

The absorption of heat by the system tends to raise the energy of the system. The performance of work by the system, on the other hand, tends to lower the energy of the system because performance of work requires expenditure of energy. Therefore the change ...

### Compare Isothermal Expansion and Adiabatic Expansion

Let us suppose that for an ideal gas, isothermal and adiabatic expansions have initial volume Vi and pressure be Pi to a common final volume Vf. If Piso and Padia are the final pressures, then: For isothermal expansion Pi Vi = Piso Vf And for adiabatic expansion, Pi ...

### In a certain process, 6000 J of heat is added to a system while the system does work equivalent to 9000 J by expanding against the surrounding atmosphere. What is the change in internal energy for the system?

The absorption of heat by the system tends to raise the energy of the system. The performance of work by the system, on the other hand, tends to lower the energy of the system because performance of work requires expenditure of energy. Therefore the change ...

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