1.

150 mL of C_(2)H_(5)OH(density = 0.78 g mL^(-1)is diluted to one litre by adding water, molality of the solution is

Answer»

2.54
11.7
2.99
29.9

Solution : `m=(W_(2) xx 1000)/(M_(2) xx W_(1)(G))`
150 mL `C_(2)H_(5) OH=150 xx 0.78 g =117.0 g=W_(2)`
Water =850 g = `W_(2)`=46 g `"mol"^(-1)
`"Molality"= `(117 xx 1000)/ (46 xx 850)=2.99`


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