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2) (a) Calculate the molality of a 20.0 per cent by weight aqueous solution of NH4Cl. (Molecular weight: NH4Cl = 53.5) (b) If this NH4Cl solution is assumed to be ideal and is completely dissociated into ions, calculate the vapor pressure of this solution at 29.0 °C. (The vapor pressure of pure water at 29 °C is 30.0 mm Hg.) (c) Actually a solution of NH4Cl of this concentration is not ideal. Calculate the apparent degree of dissociation of the NH4Cl if the freezing point of this solution is -15.3 °C. (The molal freezing point depression constant for water is 1.86 °C per molal.)
What are the percetages of each compound. Namphthalene = 17 cm^2 Phenol = 38cm^2 Toluene= 4 cm^2 E) Calculate the retention times for th following componnts from teh following information
Boron has two stable isotopes with masses of 10.01294 u and 11.00931 u. The average molar mass of boron is 10.81 u. What is the percent abundance of each isotope?
To extract quinine from an aqueous solution, what pH should be used and why? I'm not sure if you use both pKa's or just one.
A 10.4-g sample of CaCl2 is dissolved in 107 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the solution has a specific heat capacity of 4.18 J/°C ..
How many grams of antifreeze (C_2 H_4(OH)_2) would be required per 500 g of water to prevent the water from freezing at a temperature of -27 degrees celsius? answer in units of g.
Which two reagents below would you choose to synthesize 3-ethyl-2-phenyl-2-pentene using the Wittig procedure? (triphenylphosphine, solvents, and a base are provided)
freezing point ofnbsp pure 2-methyl-2propanol is noted 25.50c however it absorbs h2o as an impurity on exposure to
Many elements can have more than one charge or oxidation number. In this set of problems, we will assign oxidation numbers to each atom in sulfate, carbonate, bicarbonate, bisulfate, sulfite, nitrate, nitrite, chlorate, and perchlorate.
What is the theoretical yield in grams? What is the theoretical yield in moles? (I already have the calculated amounts of reactants) Just need theoretical yields.
Based on the sign of E°cell, classify these reactions as spontaneous or nonspontaneous as written. Assume standard conditions.
a 1 l buffer solution with ph 9.05 is desired. one of the two ingredients of the buffer is hcn. what could the other compound be? Suggest a suitable ratio and determine the exact moles of the two compounds to achieve the desired pH.
compare the properties of elements and compounds. give two examples of each including one example that exists in the
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