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Calculate the amount of heat required to completely sublime 20.0 g of solid dry ice {rm{(CO}}_2 ) at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 {{rm{kJ}}}/{{rm{mol}}}.
How many moles of HCl must be added to 1.0 L of 1.0 M NH3(aq) to make a buffer with a pH of 9.00? (pKa of NH4^+ = 9.25)
The conductivity of KCl is given as kappa=1.413ohms^-1 m^1 and the conductance of this solution is given as 1408microSiemens.
Write the formula for ionic compound formed from acetate anion ch3coo and each cation. Na, Ba, Al, Ni
High-purity benzoic acid (C6H5COOH; change H (rxn) for combustion = -3227 kj/mol) is used as a standard for calibrating bomb calorimeters. A 1.221-g sample burns in a calorimeter
Calculate the molarity of a hydrochloric acid solution that is 18.25% HCl by mass and has a density of 1.20 g/mL.
how much of heat is gained by nickel when 500 g of nickel is warmed from 22.4 to 58.4C?
A power plant burns 10^4 kg hr-1 of coal containing 2.5% sulfur. The effluent is released from a single stack of height 70 m. The plume rise is normally about 30 m.
will strontium sulfate form a precipitate at 25 degrees celcius when 345mL of a solution that is .0100M in Sr+2(aq) is added to 75mL of a .175M SrSO4
Calculate the mixing ratio (ppbv) of NO2. Assume T=20 degrees Celsius = 293 K; P = Atmospheric pressure. MW of NO2 = 44g/mol
A sample of molten iron occupies of a volume of 7.11 x 10-3 L. If the density of iron is 7.86 g/cm3, what is the mass of iron in grams in the sample?
The peak absorbance of the first chromatographic peak at 300nm was 0.020 and at 350nm 0.030. What is the main component of the first eluting peak and what percentage of the total absorbance at 300nm is due to this component?(assuming the light pat..
Draw the carboxylic acid would be formed if the malonic ester synthesis (alkylation of diethyl malonate followed by hydrolysis and decarboxylation) were carried out with a large excess of diethyl malonate, one equivalent of 1,5-dibromopentane, and..
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