QJEEM21Cha19f: JEE Main 2021 Chemistry - Class 11 JEEM21Cha19f Solution: Complete combustion of 3g of ethane gives x × 10 22 molecules…

Question

Verified Solution • 2025–26 Session moderate

Complete combustion of 3g of ethane gives x

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10²² molecules of water. The value of x is __________. (Round off to the Nearest Integer). [Use : N_A = 6.023

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10²³; Atomic masses in u : C : 12.0; O : 16.0; H : 1.0]

Accepted Answer

C_{2} H_{6} + \frac{7}{2} O_{2} \overset{}{⟶} 2 C O_{2} + 3 H_{2} O

Here,

C_{2} H_{6} = 3 g m = \frac{3}{30} = 0.1

mol

From 1 mol C₂H₆ we get 3 mol H₂O

∴

From 0.1 mol C₂H₆ we get = 3

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0.1 mol H₂O

∴

Moles of H₂O = 0.3

= 0.3

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6.023

\times

10²³ molecules

= 1.8069

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10²³ molecules

= 18.069

\times

10²² molecules

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