Which half- reaction equation represents reduction?
1) Cu --> Cu^2+ + 2e^-
2) Cu^2+ + 2e^- --> Cu
3) Ag + e^- --> Ag^+
4) Ag^+ --> Ag + e^-

The think of process to make something successful

Qand k are only the same when the forward rate of the reaction has reached zero.

Bromine has atomic number  35  which means there are  35 protons  and  44  neutrons to give a total of 79 nucleons. the fact that it's a positive ion means that it has lost an electron; so there'll be  34 electrons. 

Moles of co₂ = 2.35/44 = 0.0534 mole.from ideal gas equation pv=nrt,  t = 18+273k = 291 kelvin.∴px5 = 0.0534x0.0821x291∴p = 0.0534x0.0821x291/5 = 0.2551 atm.now, 1 atm = 760 mm of hg  ∴ 0.02551 atm = 0.02551 x 760 = 19.38 mm of hg