$3$

$.$

$$In the gas

$-$

phase reaction, A

$+$

$$B

$-$

$>$

C

$+$

$2$

$$D

it was found that when

$2$

$.$

$0$

$0$

$$mol A

$,$

$1$

$.$

$0$

$0$

$$mol B

$,$

$$and

$3$

$.$

$0$

$0$

$$mol D were mixed and allowed to come to equilibrium at

$2$

$5$

$\backslash$

deg C

$,$

$$the resulting mixture contained

$0$

$.$

$7$

$9$

$$mol C at a total pressure of

$1$

$.$

$0$

$0$

$$bar$.$ Calculate

$($

a

$)$

$$the mole fractions of each species at equilibrium,

$($

b

$)$

$$Kx

$,$

$($

c

$)$

$$K

$,$

$$and

$($

d

$)$

$\backslash$

Delta rG

$\backslash$

deg

$!$

$!$

$!$

$!$

$$In this type of questions why and when we need to divide P total to P standard? where is this equation coming from and are there any unit of these equilibrium constants?In the gas $-$ phase reaction, $A+BC+2D$

it was found that when $2\mathrm{.}00$molA,$1\mathrm{.}00$molB, and $3\mathrm{.}00$molD were mixed and allowed to come to equilibrium at $\frac{25}{\frac{?}{?}}$

degC, the resulting mixture contained $0\mathrm{.}79$molC at a total pressure of $1\mathrm{.}00$ bar. Calculate $(a)$ the mole fractions of each

species at equilibrium, $($b$)$ Kx$,($c$)$ K$,$ and $($d$)\backslash$Delta rG$\backslash$deg $!!!!$ In this type of questions why and when we need to

divide $P$ total to $P$ standard? where is this equation coming from and are there any unit of these equilibrium constants?