Physical Chemistry Answers

(1) Draw the Lewis dot structures of the following gases:
(a) O3
(b) ClF3
+
(c) N2
(d) NO2
(e) NH3
(f) CO2
Predict values of Cp,m for each, assuming (a) no contribution from vibrational degrees
of freedom and (b) full contributions from vibrational degrees of freedom. Compare
your answers to Table 2C.5. What conclusions can you draw for each?


So let's just start with the first one. I know the structure of ozone so that's not the issue, the issue is the second part. In class I was basically taught that to find the Cpm, I'd need to add up the translational, rotational, and vibration degrees of freedom. So (5/2)R for trans, (3/2)R for rotational since it's non-linear, and 3R for vibration (3(N)-6)R. So (5/2)RT+(3/2)RT+3RT =7RT... Am I on the right track or did I misunderstand my notes. My textbook gives me the Cpm of O3 as 39.20. I'm not sure how I'm supposed to compare the two numbers and what conclusions I'm supposed to draw from them.

A gasoline engine transforms approximately 34 percent of the fuel's chemical energy into mechanical energy. If energy is conserved, what happens to the other 66 percent?
A. It is transformed into friction and thermal energy
B. It is stored until a later time
C. It is used to balance out gravitational energy

Explain the term dipole moment and describe briefly its experimental determination.

For the reaction A+3B====>2C+D , initial mole of A is twice that of B. If at equilibrium moles of B and C are equal, then percent of B reacted is?

ΔHf C2H4=12.5 Kcal
Heat of atomisation of C=171 kcal
Bond energy of H2 =104.3kcal
Bond energy of C–H=99.3 kcal
What is C=C bond energy

The heat of neutrilisation of LIOH and HCL at 25 deegre C is 34.868 KJ/MOL .then find the heat of ionisation of LIOH

Which process is exothermic?
the boiling of liquid nitrogen
the vaporization of water
the freezing of water
the sublimation of dry ice

One mole of an ideal gas with Cp = (7/2) R and Cv = (5/2) R expands from P1= 8 bar & T1= 600K to P2 = 1bar by each of the following paths?

(1) Constant volume. (2) Constant temperature. (3) Adiabatically. Assuming mechanical reversibility calculate W, Q, ∆ U and ∆ H for each process

One mol of an ideal gas with initial volume of 1m3 at 50K & 2bar undergoes a four steps mechanically reversible cycle in a closed system?

In step 1-2 the volume is increasing to 5m3 at a constant pressure of 2bar; in step 2-3, pressure decreases at constant volume to 1 bar and a temp of 100 K in step 3-4 the pressure increases to 10 bar by an isothermal process; and in step 4-1 the gas return by constant volume process to initial state. * Calculate Q, W, ∆U, and ∆H for each step of the cycle. Take Cv =3/2 R; CP=5/2 R