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When solid ammonium carbonate is heated it decomposes to form ammonia gas ,carbon dioxide gas and water vapor so that the solid completely disappears write a complete balanced equation for this reac
Silver ion Ag+ reacts with SCN- ion to form silver thiocyanate(AgSCN). What change will the student observe when a solutioncontaining Ag+ ion is added to the mixture?
Butane has a heat vaporization of 22.44 kJ/mol and a normal boiling point of -0.4ºC. A 250mL sealed flask contains 0.55g of butaneat -22 ºC. How much Butane is present as liquid?
An oxide of osmium (symbol Os) is a pale yellow solid. If2.54 g of the compound contains1.90 g of osmium, what is its empirical formula?
Where in the electromagnetic spectrum (visible,ultraviolet, or infrared) does the line appear? Calculate the energy of the photon resulting form this electron transition.
A new organic acid was discovered and at 25°C a 0.115 Msolution of the acid in water had a pH of 3.42. Calculate the valueof Ka for the acid.
The percent composition of a compound Z is 63.16% C and 8.77% H.When compound Z burns in air, the only products are carbon dioxideand water The molar mass for Z is 114.
In qualitative analysis Ag+,Hg2+ and Pb2+ are separated from other cations by addition of HCl. Calculate the concentrations of Cl- required to just begin precipitation of a)AgCl b)Hg2Cl2 and c) PbCl
Calculate th enumber of moles of sodium bicarbonate originally present in the unknown mixture in question 2, knowing that 15.0 ml of 0.100 M HCl were used in the titration, using methyl orange as th
When solutions containing 25 g each of lead(II) nitrate and potassium iodide are mixed, a yellow precipitate results.
What are the spectator ions in the solution after the complete neutralization reaction occurs when mixing HI (strong acid) andNH4OH (weak base)?
What is the total vapor pressure at the same temperature above a solution containing only n-hexane and n-heptane in which the mole fraction of n-hexane is 0.600?
What is the pH range of a buffered solution composed of equallmolar concent rations of acetic acid and acetate? ka= 1.8 X10^-5
If 16.5ml of 0.120M NaOH is required to reach the first equivalence point of a solution of citric acid(H3C6H5O7), how many ml of NaOH are required to completely neutralize this solution?
The hydrolysis of ATP back to ADP has a standard Gibbs freeenergy change of -31 kJ/mol at human body temperature, 310 K. This represents the maximum non-expansion work (electrical, chemical, orbiolo
In an experiment, 40.0 mL of 0.270M barium hydroxide was mixedwith 25.0mL of 0.330 M aluminum sulfate. Write the net ionic equation for the reaction that takesplace.
Aluminum and iron blocks of the same weight are heated to 250?C. These blocks are dropped into a bucket of water. Assuming enough heat is available in the blocks, which block will heat the water th
A 35.8-g sample of cadmium metal was melted by an electric heater providing 4.66 J/s of heat. If it took 6.92 min from the time themetal began to melt until it was completely melted, what is the hea
If ΔG= - and ΔS= + for two dissolving process, how could one be endothermic and one be exothermic? is there more to consider than just the dissolving process?
When copper (II) sulfate penthydrate is heated, the deep blue color of the hydrate changes to the white color of the anhydrous salt. Determine why such a vivid change in color is common when such e
The concentrated sulfuric acid we use in the laboratoryis 94.1 percent H2SO4 by mass. Calculate the molality and molarity of the acid solution. The density of the solutionis 1.80 g/mL.
If the concentration of flouridated drinking water is 1 X 10-5 M and the calcium ion concentration in blood is 2.5 X 10 -3 M,then why is there no danger of CaF2 precipitating in the blood stream aft
The freezing-point depression of a 0.500m MgSO4 solution is 0.265°C. Determine the experimental van't Hofffactor of MgSO4 at this concentration.
A sample of neon occupies 105 liters at 27 degrees C under a pressure of 985 torr. What volume would it occupy at standard conditions?
The concentration of commercially available concentrated nitricacid is 70.0 percent by mass, or 15.9 M. Calculate the density of the solution.