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SS1 Chem concentration of solu
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A commerical ammonia called '0.68 ammonia' has a density of 0.68 g cm ^-3and contains approximately 34% of ammonia by mass.a) Calculate the mass of ammonia present in 1 dm^3 of the solution of this commercial ammonia.b) Calculate the molarity of this solution.c) Calculate the volume of... 顯示更多 A commerical ammonia called '0.68 ammonia' has a density of 0.68 g cm ^-3 and contains approximately 34% of ammonia by mass. a) Calculate the mass of ammonia present in 1 dm^3 of the solution of this commercial ammonia. b) Calculate the molarity of this solution. c) Calculate the volume of distillated water added if the solution has to be diluted to 1 mol dm^-3. ( Relative atomic masses: H = 1.0, N = 14.0)
最佳解答:
a) 1 dm3 of the solution weighs 1000 x 0.68 = 680 g So mass of ammonia = 680 x 34% = 231.2 g b) No. of moles of ammonia = 231.2/17 = 13.6 So its molarity = 13.6 M c) To make it up to 1 M, resulting volume should be 13.6 dm3. Hence volume of water needed to be added = 12.6 dm3.
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