8.9. Consider the reactions:
(a) 6CO₂(g) + 6H₂O(l) →C₆H₁₂O₆(s) + 6O₂(g)

(b) O₃(g) + H₂O₂(l) →H₂O(l) + 2O₂(g)
Why it is more appropriate to write these reactions as:
(a) 6CO₂(g) + 12H₂O(l) →C₆H₁₂O₆(s) + 6H₂O(l) + 6O₂(g)
(b) O₃(g) + H₂O₂ (l) →H₂O(l) + O₂(g) + O₂(g)
Also suggest a technique to investigate the path of above (a) and (b) redox reactions.

(a) Therefore, it is more appropriate to write the equation for photosynthesis as (iii) because it emphasises that 12H₂O are used per molecule of carbohydrate formed and 6H₂O are produced during the process.

(b) The purpose of writing O₂ two times suggests that O₂  is being obtained from each of the two reactants.

The path of reactions (a) and (b) can be determined by using  H₂O₂¹⁸ or D₂O in reaction
(a) or by using  H₂O₂¹⁸ or O₃¹⁸in reaction (b).

<p><picture><img src="https://images.shiksha.com/mediadata/images/articles/1741861008phpehTSDV.jpeg" alt="" width="415" height="88"></picture></p><p><strong> (a) </strong>Therefore, it is more appropriate to write the equation for photosynthesis as (iii) because it emphasises that 12H₂O are used per molecule of carbohydrate formed and 6H₂O are produced during the process.</p><p><strong> (b)</strong> The purpose of writing O₂&nbsp;two times suggests that O_2&nbsp;&nbsp;is being obtained from each of the two reactants.</p><div><div><picture><source srcset="https://images.shiksha.com/mediadata/images/articles/1741861065phpjZIYHB_480x360.jpeg" media=" (max-width: 500px)"><img src="https://images.shiksha.com/mediadata/images/articles/1741861065phpjZIYHB.jpeg" alt="" width="289" height="61"></picture></div><div>The path of reactions (a) and (b) can be determined by using&nbsp;_&nbsp;H₂O₂¹⁸&nbsp;or D₂O in reaction<br> (a) or by using&nbsp;_&nbsp;H₂O₂¹⁸&nbsp;or O₃¹⁸in reaction (b).</div></div>

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