1.

The largest number of molecules inA. (a)`36 g` of waterB. (b)`28 g` of carbon monoxideC. (c )`46 g` of ethyl alcoholD. (d)`54 g` of nitrogen pentoxide

Answer» Correct Answer - A
(a)`18 g` of `H_(2)O=6.02xx10^(23)` molecules of `H_(2)O`
`:. 36 g` of `H_(2)O=2xx6.02xx10^(23)` molecules of `H_(2)O`
`=12.04xx10^(23)` molecules of `H_(2)O`
(b) `28 g` of `CO=6.02xx10^(23)` molecules of `CO`
(c ) `46 g` of `C_(2)H_(5)OH=6.02xx10^(23)`molecules of `C_(2)H_(5)OH`
(d) `108 g` of `N_(2)O_(5)=6.02xx10^(23)` molecuiles of `N_(2)O_(5)`
`:. 54 g` of `N_(2)O_(5)=1/2xx6.02xx10^(23)` molecules of `N_(2)O_(5)`
`=3.01xx10^(23)` molecules of `N_(2)O_(5)`
`:. 36 g` of water has highest number of molecules.


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