A gas mixture consists of 2.0 moles of oxygen and 4.0 moles of neon at temperature T. Nelglecting all vibrational modes, calculate the total internal energy of the system. (oxygen has two rotational modes).

A ballon has 5.0 g mole of helium at 7^@C calculate the total internal eneryg of the system.

Calculate the number of atoms in 0.20 mole molecules of oxygen

A flask P contains 0.5 mole of oxygen gas. Another flask Q contains 0.4 mole of ozone gas. which of the two flasks contain greater number of oxygen atoms.

Calculate the number of oxygen atoms in 0.10 mole of Na_2CO_3* 10H_2O .

An ideal gas expand against a constant external pressure at 2.0 atmosphere from 20 litre to 40 litre and absorb 10kJ of energy from surrounding . What is the change in internal energy of the system ?

An armature coil consists of 20 turns of wire, each of area A = 0.09 m^2 and total resistance 15 ohm . It rotates in a magnetic field of 0.5 T at a constant frequency of 150//pi . Calculate the value of maximum induced e.m.f. produced in the coil.

An armature coil consists of 20 turns of wire, each of area A = 0.09 m^2 and total resistance 15 ohm . It rotates in a magnetic field of 0.5 T at a constant frequency of 150//pi . Calculate the value of average induced e.m.f. produced in the coil.

Surface tension is exhibited by liquids due to force of attraction between molecules of the liquid. The surface tension decreases with increase in temperature and vanishes at boiling point. Given that the latent heat of vaporation for water rho_(w) = 540kcal/kg ,mechanical equivalent heat =4.2j/cal Avogadro's No. N_A = 6.0 xx 10^26 , and the molecular weight of water M_A = 18 kg for 1 k mole. Estimate the energy required for oe molecule of water to evaporate.

Two parallel plate capacitors A and B have the same separation d= 8.85xx10^-4m between the plates. The plate area of A and B are 0.04m^2 and 0.02m^2 respectively. A slab of dielectric constant (relative permittivity) K=9 has dimensions such that it can exactly fill the space between the plates of capacitor B. A is then charged to a potential difference of 110V. Calculate the capacitance of A and the energy stored in it.

Fuel cells convert the energy produced during the combustion of fuels cells directly into electrical energy. Probably the most successful fuel cell so far is hydrogen oxygen fuel cell, which has ben used in spacecraft. The electrodes consist of porous screens of titanium coated with a layer of platinum catalyst. concentrated KOH or NaOH soloution is placed beween the electrodes to serve the as electrolyte. hydrogen and oxygen gases are bubbled through the porous electrodes into the electrolyte solution The following electrodes reactions occur: At anode: 2H_2(g)+4OH^(-)(aq)rarr4H_2O(l)+4bare At cathode: O_2(g)+2H_2O(l)+4barerarr4Oh^-(aq) Overall reaction: 2H_2(g)+O_2(g)rarr2H_2O(l) In this cell, the gaseous materials are consumed and continously supplied. The thermodynamic properties of fuel cell reaction at 25^@C are: DeltaH^@=-285.8kJ mol^-1,DeltaG^@=-237.2kJ mol^-1, E^@=1.23V If the potential of the half cell reaction is at cathode is, E^@=0.41V , then E^@ for the half cell reaction at anode is