1.

At 373 K, a gaseous reactionto2B+C is found to be of first order. Starting with pure A, the total pressure at the end of 10 min. was 176 mm and after a long time when A was completely dissociated, it was 270 mm. The pressure of A at the end of 10 minutes was

Answer»

94 mm
47 mm
43 mm
90mm

Solution :`A to2B + C`
Initialp00
Eq. PP-p2pp
TOTAL `= P-p+2p + p=P+2p= 176M m`
(complete DISSOCIATION = 2P + P)
Total = 3P = 270 m m or P = 90 mm
`:.` 2p = 176 - P = 176 - 90 = 86 mm
or p = 43 mm
Pressure of A after 10 MIN = P -p
`= 90 - 43 = 47mm`


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