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The energy needed to ionize an atom of Al when it is in its most stable state is 577.6 kJ mol-1. However, if an atom of Al is in a certain low-lying excited state, only 274.4kJ mol-1 is needed to ionize it. What is the wavelength of the radiation emitted when an atom of Al undergoes a transition from this excited state to the ground state?
Which law is supported by each of the following statements? (The laws are: conservation of mass, definite proportion, and multiple proportions.)
Ammonia condenses to form a liquid at -33.35C at atmospheric pressure. The density of liquid ammonia at this temperature is 0.6818g/ml. If the ammonia (0.224ml) is condensed at these temperatures, what would be its volume?
An office heater puts out 2010 Btus (British thermal units) of energy in the form of heat per hour. Given that 1 Btu = 1.055 kJ, how many megajoules of energy in the form of heat can be produced per year (365 days) by the heater (assume continuous..
If a solution of Na2CO3 has a pH of 10. The CO32- on is the conjugate base of the HCO3- ion. State the net ionic equation for the reaction which makes a solution of Na2CO3 basic.
Write the half-reaction that occurs at a hydrogen electrode in acidic aqueous solution when it serves as the anode of a voltaic cell?
Calculate the number of formula units of the compound and the number of each ion in 3.75 moles of AlCl3.
Problem- A sample of gas occupies a volume 185.5 mL at STP. What pressure, in torr, would it exert if it is transferred to a gas bulb with a volume of 255.5 mL in which the temperature is maintained at 34.5 degree Celsius
Find out the volume needed to prepare a 7mM concentration of alpha-mercaptoethanol (density= 1.17) in a 1000mL solution
The fuel used in many disposable lighters is liquid butane, C4H10. Butane has a molecular weight of 58.1 grams in one mole.
Why is the iodine added. What is the role of the magnesium in this reaction. Why is the 3-phenylpropyl-bromide mixed with anhyrous diethyl ether. What does the dry ice do. What does the HCl do
A student traces of brown deposite during the KMnO4 (NH4)2Fe(SO4)2 titration and quickly add more H2SO4 and continued his titration?Suggest what wil happen and why.
Write an equation for the formation of the salt that could be formed by reaction of one molecule of adipic acid with two molecules of ethylamine
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