The largest number of molecules in

Options

A. (a)`36 g` of water
B. (b)`28 g` of carbon monoxide
C. (c )`46 g` of ethyl alcohol
D. (d)`54 g` of nitrogen pentoxide

Answer

A

Explanation

(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.