Physical Chemistry Answers

How many moles of silver (I) sulfide, Ag2S, are formed when a 269.7 g sample of silver tarnishes in the presence of sulfur?

Please explain how to solve this problem

What is Eo for the cell Ag l AgBr(s) I Br- (a1), Fe3+ (a2), Fe2+ (a3) l Pt . Given : Standard half-cell reduction potentials as
AgBr l Ag, (Eo)1/2 = 0.0713 V, Fe3+ l Fe2+, (Eo)1/2 = 0.771 V.
If a1 = 0.34, a2 = 0.1 & a3 = 0.02, then find Q, the reaction Quotient is Q = 0.588. Hence find E for the cell.

AT 27 DEGREE TEMPERATURE AND 16.5 ATM PRESSURE NH3 IS IN A CLOSED POT.AT 327 DEGREE TEMPERATURE IT PARTIALLY DISSOCIATES.AT EQUILIBRIUM THE PRESSURE INCREASED AT 45.5 ATM.HOW MUCH NH3 DISSOCIATES TO REACH EQUILIBRIUM.
2NH3=N2+3H2 THE ANS IS 37.8787% BUT HOW?

at 727 degree temperature the equilibrium constant of this reaction is 256.
2SO2 +O2=2SO3
WHAT IS THE EQUILIBRIUM CONSTANT AT SAME TEMPERATURE FOR THIS REACTION
2SO3=2SO2 +O2
ANS 6.25*10^-2 HOW??

1 g H2 and 46g I2 ARE MIXED IN 450 DEGREE TEMPERATURE TO GET HI.1.9 G I2 IS FOUND AT LAST.WHAT IS THE VALUE OF EQUILIBRIUM CONSTANT? ANS 46.94 HOW?PLEASE SHOW ME THE PROCESS

at 425 degree centigrade temperature the equilibrium constant of this reaction is 52.5.if at initial,1 mol H2 and 0.75 mol I2 reacts, then how much HI will be found in equilibrium at mole unit. the ans is 0.0911 mol. but i cant get the solution. please help. the reaction is

H2+I2=2HI

IN A 1 L POT At 420 degree temperature HI dissociates and in equilibrium 1472 g HI 18.6 G H2 and 546.1 g I2 IS FOUND.what is the equilibrium constant?
the ans is 0.1398 but how????
atomic mass of I =127

Derive the equation of corresponding states

In a solution 0.200 kg each of water and ethanol are present. Calculate the mole fraction of each component.

Deduce the SI units for the gas constant, R.