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Question Q139) Ammonia gas is passed into water, yielding a solution of density 0.93 g/cm3 and containing 18.6% NH3 byweight. The mass of NH3 per cc of the solution is



SOLUTION

Density is0.93g/cm3 or 0.93g/mL
Thus weight of 1mL NH3 solution is 0.93g
Since NH3solution if of 18.6% by weight
∴ 18.6%of 0.93 g = 0.1728 g ≈ 0.17g/cm3
Answer(a)