Complete combustion of 3 g of ethane gives x × 10 22 molecules of water. The value of x is ______ (Round off to the Nearest Integer). Use : N A = 6 . 023 × 10 23 ; Atomic masses in u : C : 12 . 0 ; O

Question

Complete combustion of 3 g of ethane gives x × 10 22 molecules of water. The value of x is ______ (Round off to the Nearest Integer). Use : N A = 6 . 023 × 10 23 ; Atomic masses in u : C : 12 . 0 ; O : 16 . 0 ; H : 1 . 0

TestHub · Accepted Answer

C 2 H 6 + 7 2 O 2 → 2 CO 2 + 3 H 2 O MW C 2 H 6 = 30 g 30 g o f C 2 H 6 gives rise to 3 moles of H 2 O 3 g of C 2 H 6 gives rise to 0 . 3 moles of H 2 O No. of molecules = 0 . 3 × 6 . 023 × 10 23 = 18 . 069 × 10 22

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