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अभिक्रिया 2A + B → A,B के लिए वेग = k[A] [B]2, यहाँ k का मान 2.0 × 10-6 mol-2 L2 s-1 है। प्रारम्भिक वेग की गणना कीजिए, जब [A] = 0.1 mol L-1 एवं [B] = 0.2 mol L-1 हो तथा अभिक्रिया वेग की गणना कीजिए, जब [A] घटकर 0-06 mol L-1 रह जाये। 

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प्रारम्भिक वेग = k [A] [B]2

= (2.0 × 10-6 mol-2 L2 s-1) × (0.1 mol L-1) (0.2 mol L-1)2

= 8.0 × 10-9 mol L-1 s-1

जब [A] 0.10 mol L-1 से घटकर 0.06 mol L-1 रह जाता है अर्थात् 0.04 mol L-1 A अभिकृत हो जाता है, तब अभिकृत

B की सान्द्रता

= 12 × 0.04 mol L-1

= 0.02 mol L-1

अतः [B] = 0.2 - 0.02 = 0.18 mol L-1

वेग = (2.0 × 10-6 mol-2 L2 s-1)

(0.06 mol L-1) (0.18 mol L-1)2

= 3.89 × 10-9 mol L-1s-1

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