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calculate the rydberg constant r if he+ions are knoen to have the same wavelength difference betweenthe first of the longest wavelength lines of balmer and lyman seriies equal to 133.7 nm
The standard enthalpy of formation of NH3(g) is -46.0 kJ/mol. Calculate the thermal energy evolved when 8.0g of H2(g) react with an excess of N2(g).
the second-order reaction 2 mnco5 mn2co10 has a rate constant equal to 3.0 x 109 m-1s-1 at 25degc. if the initial
A 50% KOH solution (d= 1.52 g/mL) is made by adding 50 grams of KOH and enough water until the weight of the solution is 100 g. Calculate the molarity of the 50% KOH solution.
Write the chemical reactions for the steps typically used to isolate titanium metal from titanium dioxide. What is the oxidation number for titanium in each step of the reaction?
The density of lead is 11.3 g/ml. The water level in a graduated cylinder initially at 220mL rises to 297mL after a piece of lead is submerged. What is the mass in grams of the lead?
boron has two naturally occuring isotopes,, 10B (19.9%) and 11B(80.1. althought the b2 molecule doesn not exist naturally on earth, it been been produced in the laboratory and been observed in stars..
The amount of carbon-14 in ancient artifacts and fossils is often used to establish their age. Determine the number of protons and neutrons in a carbon-14 isotope and write its symbol in the form
If you mix 50mL of 0.34M HCN with 100mL of 0.17M KOH what is the pH of the resulting solution. (Ka=4.0 x 10^-10)
KEtones also undergo the aldo condensation, although a succesful reaction often requires "enhanced" conditions, since the addition involves an unfavorable equilibrium constant.
an aqueous soultion of uknown salt of ruthenium is electrolyzed by a current of 2.50 amps passing for 50 min. if 2.618 g Ru is produced at the cathode, what is the charge on the ruthenium ions in solution?
Question- At a given temperature, you have a mixture of benzene (vapor pressure of pure benzene = 745 torr) and toluene (vapor pressure of pure toluene = 290 torr). The mole fraction of benzene in the vapor above the solution is 0.590. What is the..
115 grams of KCl is dissolved in 750mL of water (assume density=1.005g/mL). What would be the freezing point and boiling point of that solution assuming the Kf of water is 1.86oC/m and Kb is 0.512oC/m (assume that KCl fully dissociates with no pai..
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