# Mole Concept

Chemistry Level 3

$$\text{105 ml}$$ of pure water at $$4^{\circ}C$$ saturated with $$\ce{NH3}$$ gas yielded a solution of density $$\text{0.9 g ml}^{-1}$$ and containing $$\text{ 30 %} \ce{NH3}$$ by mass. Let the volume of $$\ce{NH3}$$ solution resulting be $$\text{A ml}$$ and the volume of $$\ce{NH3}$$ gas at $$4^{\circ}C$$ and $$\text{775 mm } \ce{Hg}$$ pressure used to saturate water be $$\text{B litre}$$. Find $$\text{A+B}$$

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