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नीचे दर्शाये गए समय में 899 K पर `K_(P)` का मान 0.04 atm है। `C_(2)H_(6)` की साम्य पर सांद्रता क्या होंगी यदि 4.0 atm दाब पर `C_(2)H_(6)` को एक फ्लास्क में रखा गया है एवं साम्यवास्था पर आने दिया जाता है?
`C_(2)H_(6)(g) ltimplies C_(2)H_(4)(g) + H_(2)(g)`

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`C_(2)H_(6)(g) ltimplies C_(2)H_(4)(g) + H_(2)(g)`
`{:(प्रारंभिक दाब,4,0,0),(साम्य पर दाब,4.0-p,P,P):}`
`K_(P) = (P_(C_(2)H_(4)) xx P_(H2))/(P_(C_(2)H_(6))`
`0.04 = (P xx P)/(4.0-P)`
`P^(2) =0.16-0.04 P`
`P^(2) + 0.04 P -0.16=0`
`P=((-0.04)+-sqrt(0.0016 - 4 xx 1 xx (-0.16)))/(2 xx 1)`
`=((-0.04 +- 0.8)/(2)) = 0.76/2=0.38`
साम्य पर `C_(2)H_(6)` का दाब `=4.0 - 0.38 = 3.62` atm

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