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एक प्रथम कोटि अभिक्रिया के लिए दर स्थिरांक k का मान `7.39 xx 10^(-5) " सेकण्ड"^(-5)` मापा गया , अभिक्रिया के अर्ध्द- आयुकाल की गणना कीजिए।

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प्रथम कोटि अभिक्रिया के लिए अर्ध्द- आयुकाल
`t_(1//2) = ( 0.693)/(k) = (0.693)/(7.39 xx 10^(-3))`
`=9377 .53` सेकण्ड़

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