At1000K, water vapour at 1 atm has been found to be dissociated Into hydrogen and oxygen to the extent of `3 xx 10^-5%` . Calculate the free energy decrease of the system, assuming ideal behaviour.

Calculate the total pressure in a 10 L cylinder which contains 0.4 g of helium, 1.6 g of oxygen and 1.4 g of nitrogen at 27^(@) C. Also calculate the partial pressures of He gas in the cylinder. Assume Ideal behaviour for gases. R = 0.082 L atm k^(-1) mol^(-1)

Calculate the total pressure in a 10 litre cylinder which contains 0.4 g He, 1.6 g O_2 and 1.4 g N_2 at 27^@C . Also calculate the partial pressure of Helium gas in the cylinder. Assume ideal behaviour of gas (R=0.082 litre-atm K^(-1)mol^(-1)

In an experiment, at a total of 10 atmospheres and 400^@C , in the equilibrium mixture 2NH_3(g) iff N_2(g) + 3H_2(g) the ammonia was found to have dissociated to the extent of 96% . Calculate K_p for the reaction.

The time required of 10% completion of a first order reaction at 298K is equal to that required for its 25% completion at 308K. If the pre-exponential factor for the reaction is 3.56xx10^9 S^(-1) . Calculate. Its rate constant at 318K and also the energy of activiation. [R=8.314 JK^(-1) mol^(-1) .

The time required for 10% completion of a first order reaction at 298K is equal to that required for its 25% completion at 308K. If the pre-exponential factor for the reaction is 3.56xx10^(9)s^(-1) , calculate it's rate constant at 318k and also the energy of activation.

Copper has 8.0xx10^(28) conduction electrons per metre^3 . A copper wire of length 1m and cross sectional area 8.0xx10^(-6) m^2 carrying current and lying at right angle to a magnetic field of strength 5xx10^(-3) T experiences a force of 8.0xx10^(-2)N . Calculate the drift velocity of free electrons in the wire.

In has been estimated that the total energy radiated by the sun is 3.8xx10^26 J per second. The source of energy of stars is a thermonuclear reaction called nuclear fusion. Fusion reactions are not controlled. It is presumed that the energy of stars is due to two processes called proton-proton cycle and carbon nitrogen cycle. Fusion cannot take place at ordinary temperature. This, hydrogen bomb uses a small fission bomb, which on explosion causes the temperature to rise very high about 10^7 K. We have yet to see how a hydrogen bomb can be used for peaceful life-sustaining purpose. Energy released in the process of fusion is due to mass defect. It is also called Q-value. Q =Deltamc^2 , Deltam= mass defect Answer the following questions based on above passage: Fusion reaction takes place at about:

Einstein established the idea of photons on the basis of Planck's quantum theory. According to his idea, the light of frequency f or wavelength lamda is infact a stream of photons. The rest mass of each photon is zero and velocity is equal to the velocity of light (c) = 3 xx 10^(8) m.s^(-1) . Energy, E = hf, where h = Planck's constant = 6.625 xx 10^(-34)J.s . Each photon has a momentum p = (hf)/(c) , although its rest mass is zero. The number of photons increase when the intensity of incident light increases and vice-versa. On the other hand, according to de Broglie any stream of moving particles may be represented by progressive waves. The wavelength of the wave (de Broglie wavelength) is lamda = (h)/(p) , where p is the momentum of the particle. When a particle having charge e is accelerated with a potential difference of V, the kinetic energy gained by the particle is K= eV. Thus as the applied potential difference is increased, the kinetic energy of the particle and hence the momentum increase resulting in a decrease in the de Broglie wavelength. Given, charge of electron, e = 1.6 xx 10^(-19)C and mass = 9.1 xx 10^(-31) kg . The number of photons emitted per second from a light source of power 40 W and wavelength 5893 Å