Two solid compounds A and B dissociate into gaseous products at 20°C as
(i) A(s) 
A'(g) + H 2 S(g) (ii) B(s) 
B'(g) + H 2 S(g)
At 20°C pressure over excess solid A is 50 mm and that over excess solid B is 60 mm find :
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
= 625 mm 2 , 
= 900 mm 2 
A(s) 
A'(g) + H 2 S(g) B(s) 
B'(g) +H 2 S(g)
A(s) 
A'(g) + H 2 S(g) P = 50 mm ⇒ 
= P A’ = P/2 = 25 mm
B(s) 
B'(g) +H 2 S(g) P = 60 mm ⇒ 
= P B’ = P/2 = 30 mm
(i) 
= (25) 2 = 625 mm 2
= (30) 2 = 900 mm 2
(ii) Ratio of moles is same as that of partial pressure so
A(s) 
A'(g) + H 2 S(g)
P 1 P 1 + P 2
B(s) 
B'(g) + H 2 S(g)
P 2 P 2 + P 1
= P A' x 
= P 1 (P 1 + P 2 ) ......... (i)
= P B' x 
= P 2 (P 1 + P 2 ) ......... (ii)
= 
= 
(iii) total pressure = P 1 + P 2 + (P 1 + P 2 ) = 2(P 1 + P 2 )
(i) + (ii) = (P 1 + P 2 ) 2
= P 1 + P 2
P T = 2 × ( 
) = 39 mm.
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