13) Ammonia gas is passed into water, yielding a solution of density 0.93 g/cm3 and containing 18.6 % NH3 by weight. The mass of NHper cc of the solution is.
( 1 )   0 . 17   g / c m 3 ( 2 )   0 . 34 g / c m 3 ( 3 )   0 . 51   g / c m 3 ( 4 )   0 . 68   g / c m 3

Dear student, 

Density = Mass / Volume
Mass = Density x Volume
Density = 0.93g/cc
Mass of 1 cc of solution = 0.93 x 1= 0.93g
1 cc of solution =0.93g
Solution contains 18.6% NH3 by mass

Therefor, 1 cc of solution = 18.6% of 0.93g NH3

                                         = (18.6/100) x 0.93 = 0.173g

So, mass of NHper cc of solution is 0.173g.
Answer is option 1

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