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नियत आयतन पर `SO_2Cl_2` उष्मीय वियोजन की प्रथम कोटि की अभिक्रिया के लिए निम्न आंकड़े प्राप्त हुए
`SO_2Cl_(2(g))rarrSO_(2(g))+Cl_(2(g))`
जब कुल दाब 0.65 atm हो तो अभिक्रिया का वेग ज्ञात कीजिये
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प्रारम्भिक दाब `P_0=0.5atm ` तथा समय t पर दाब `P_t` हो तो
`K=(2.303)/tlog""P_0/(2P_0-P_t)" "(thereforeP_t=0.6atm)`
`=(2.303)/(100)log""(2.303)/(100)log""(0.5)/(2xx0.5-0.6)`
`=(2.303)/(100)log""(0.5)/(0.4)=2.23xx10^(-3)" सेकण्ड"^(-1)`
जब `P_t=0.65atm,P_0=0.50`
`P=P_t-P_0=0.65-0.50=0.15atm`
जब कुल दाब 0.65 atm है तो `SO_2CL_2` का दाब
`P_(SO_2Cl_2)=P_0-P=0.50-0.15=0.35`
वेग `=KxxP_(SO_2Cl_2)`
`=2.23xx10^(-3)xx0.35`
= `78.05xx10^(-4)atm" सेकण्ड"^(-1)`

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