Question

Ammonia gas is passed into water, yielding a solution of density $0.93\frac{g}{{cm}^3}$ and containing 18.6% ${NH}_3$ by weight. The mass of ${NH}_3$ per cc of the solution is?

• A. $0.17\frac{g}{{cm}^3}$
• B. $0.34\frac{g}{{cm}^3}$
• C. $0.51\frac{g}{{cm}^3}$
• D. $0.68\frac{g}{{cm}^3}$

Answer 1

The correct option is A $0.17\frac{g}{{cm}^3}$

$Density=\frac{Mass}{Volume}$

So, $Mass=Density\times Volume$

$Density=0.93g/cc$

Mass of 1 cc of solution $=0.93\ast 1=0.93g$

1 cc of solution $=0.93g$

Solution contains $18.6$ ammonia by weight.

So,1 cc of solution $=18.6$ ammonia $=\left(18.6/100\right)\ast 0.93=0.173g$

So, this comes the mass of ammonia per cc of solution which is $0.173g.$