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13) Ammonia gas is passed into water, yielding a solution of density 0.93 g/cm^{3} and containing 18.6 % NH_{3 }by weight. The mass of NH_{3 }per cc of the solution is.

$\left(1\right)0.17g/c{m}^{3}\phantom{\rule{0ex}{0ex}}(\hspace{0.17em}2)0.34g/c{m}^{3}\phantom{\rule{0ex}{0ex}}\left(3\right)0.51g/c{m}^{3}\phantom{\rule{0ex}{0ex}}\left(4\right)0.68g/c{m}^{3}$

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% NH

_{3}by mass

Therefor, 1 cc of solution = 18.6% of 0.93g NH_{3}

= (18.6/100) x 0.93 = 0.173g

So, mass of NH_{3 }per cc of solution is 0.173g.

Answer is option 1

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