What is the change of entropy for 1/2 mol of nitrogen gas being mixed with 1/2 mol of oxygen gas at standard temperature and pressure (stp)? (express answer in units of j/k or j/kmol)

2. what is the change of entropy for one third (1/3) mole each of nitrogen, oxygen and carbon dioxide gases mixed at stp? (express answer in units of j/k or j/kmol)

3. sulfur dioxide gas (so2 (g)) can react with the oxygen gas (o2 (g)) in air to create sulfur trioxide gas (so3 (

(a) find the equilibrium ratio of sulfur trioxide to sulfur dioxide gas at standard conditions in air at 25oc and 1 atm. you can assume that air is 20% oxygen and 80% nitrogen gas by volume.

(b) so3(g) can further react with water vapor to form sulfuric acid, h2so4 (g). air that is in equilibrium with liquid water at 25oc has a partial pressure of h2o (g) of 0.05 atm. find the equilibrium ratio of partial pressures of h2so4 (g) to so3 (g) in air at 25oc.

idk sorry i only needs point for apex

explanation:

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.