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Q.

Complete combustion of 3g of ethane gives x×1022 molecules of water. The value of x is ______. (Round off to the Nearest Integer).[Use: NA=6.023×1023 ; Atomic masses in u:C:12.0,O:16.0;H:1.0]

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answer is 18.

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Detailed Solution

C2H6+72O2→ 2CO2+3H2OOne node of ether i.e. 30gr gives 3×6.023×1023 moles of H2OSo 3 grams can give 18×1022 molecules

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