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Complete combustion of 3 g of ethane giv...

Complete combustion of 3 g of ethane gives`x xx 10^(22)` molecules of water. The value of x is _______ . (Round off to the Nearest Integer).
[Use : `N_A = 6.023xx10^(23)` , Atomic masses in u : C : 12.0 , O : 16.0 , H : 1.0]

Text Solution

Verified by Experts

The correct Answer is:
18
`C_(2)H_(6) + 7/2O_(2) to 2CO_(2)+ 3H_(2)O`
Number of moles of ethane `3/30 = 0.1`
Number of moles of water `=3 xx 0.1 = 0.3`
`=6.023 xx 10^(23) xx 0.3`
`=18.069 xx 10^(22)`
`=18 xx 10^(22)`
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