Answer to Question #120553 in Inorganic Chemistry for billy

Question #120553
How many grams of ammonium chloride must be added to 0.050 kg of water to produce a
solution that freezes at -5.00 °C? The cryoscopic constant of water is 1.86 °C kg mol-1
. The
molar mass of ammonium chloride is 53.5 g mol-1
.
1
Expert's answer
2020-06-08T15:25:30-0400

WB - ?; MB = 53.5 g/mol; WA = 0.05 kg; ∆T = 5 °C

∆T = (Kf×WB)/(MB×WA)

WB = (∆T×MB×WA)/Kf

WB = (5 °C × 53.5 g/mol × 0.05 kg)/(1.86 °C kg/mol) = 7.19 g

Answer: 7.19 g

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