An aqueous solution is 26.0% by mass ammonia, nh3, and has a density of 0.904 g/ml. what is the molality of ammonia?

Question

Chemistry

Koen Rivers

22 August, 10:28

An aqueous solution is 26.0% by mass ammonia, nh3, and has a density of 0.904 g/ml. what is the molality of ammonia?

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Answers (1)

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Johan Hawkins · Answer 1

V=1cm³

ms = 0,904g * 0,26 = 0,23504g

M=17,04g/mol

n = m / M = 0,23504g / 17,04g/mol ≈ 0,0138mol

mso = 0,904g - 0,23504g = 0,66896g

C = 0,0138mol / 0,66896g = 0,021 mol/0,001kg=21 mol/kg