Molecular Physics | Thermodynamics Answers

Maximum number of lines in paschan back effect.

For the Otto cycle of air shown, P1= 1 bar, T1 = 290 K, V1 = 400
cm3. If T3 = 2200 K and compression ratio is 8, find (a) the heat addition, in kJ, (b) the net work, in kJ, (c) the thermal efficiency.
The mass of the air is 0.48 g.

3. A turbine has a power output of 7500 kJ/sec when steam with a mass flow rate of 11.11
kg/sec enters the turbine at 773 K, 8MPa and leaves as saturated vapor at 40 kPa. If the
surrounding of the turbine is at 25 °C, find the rate of entropy generation at steady state.

Potential temperature contain information on internal energy and geopotential energy

Validate that properties like enthalpy or specific heat of a mixture can be estimated from the composition of the mixture and property values for the consistent gases.

Validate that air has molecular weight of 28.97kg/(k mol).

A Carnot engine 'X' operates between temperature T(1) and T(2) And (T(1)>T(2)). A second Carnot engine 'Y' uses all the heat rejected by the engine 'X' and operates between temperature T(2) and T(3)
( where T(2)>T(3)). The efficiency of this combined X and Y together engine is?
ANS:1- {[T(2)+T(3)]/T(1)}

A 10-gram bullet fired at 100 m/s collides with a block of wood at rest. The mass of the block is 490 grams. The collision is inelastic. What is the speed of the block and bullet after collision? (Unit in m/s)

1.The half-life for the reactant A in the first order reaction A → B is 36.2 seconds. What is the
rate constant for this reaction at the same temperature?

2. The rate constant for the second order reaction 2NO2 → N2O4 is 2.79 L/mol·min at
48°C. If the initial concentration of NO2 is 1.05 M. What is the half-life?

3. The decomposition of dinitrogen pentoxide obeys the rate-law expression rate = 0.080 min-1
[N2O5].
If the initial concentration of N2O5 is 0.30 M; What is the concentration after 2.6 minutes?
N2O5 → N2O3 + O2

4. A chemical reaction A → B + C is first order in A and has a rate constant of 1.2 x 10-3 min-1
. If
the initial concentration of A is 0.40 M, how much time must pass in order to reduce the concentration of A to 0.22 M

A body at rest is given an initial acceleration of 8.0m/square for 30sec after which the acceleration is reduced to 50m/s square for next 20sec . The body maintains the speed attained for 60sec after which is brought to rest in20sec.draw the velocity time graph