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an electron makes a transition from n = 7 to n = 5. what is the energy associated with this transition
When 2.5000g of NaOH were dissolved in 49.0g water in a calorimeter at 24.0C, the temperature of the solution went up to 37.1C.
The activation energy of a certain reaction is 45.3kJ/mol . At 24{~}^{\circ}\rm C , the rate constant is 0.0160s^{-1} . At what temperature in degrees Celsius would this reaction go twice as fast?
Gallium has two common isotopes Ga-69 and Ga-71. Suppose we wanted to use the Ga-71 isotope for some reason, and obtained a pure 6.0g sample of Ga-71.
Imagine that you have two iron blocks, one with a mass 226 g at a temperature of 46.0 oC, and another with a mass 380 g at a temperature of 134 oC. The two blocks are brought into contact with each other in an insulated container. What is the fina..
A sample of helium gas, He, at 22 degrees C and 101.3 kPa occupies a volume of 2.54L. At a constant pressure, what volume will it occupy at a liquid nitrogen tempature of -197 degrees C?
Household vinegar is aqueous 5.00% acetic and CHC2H3O2 SOLUTION(by mass), if the density is 1,01g/ml calculate the mole fraction, molarity and molality.
2KClO3 + heat > 2KCl + 3O2, How many moles of O2 form as 3.0 mol of KClO3 are totally consumed.
Consider the titration of 46.0 mL of 1.2 M NaOH with 1.0 M HCl. Find the pH at the following points. A)After the addition of a large excess of acid
The molar mass of the substance was found to be about 300g/mol. what is the molecular formula of the unknown powder? was the substance cocaine?
25 mL of 0.100 M AgNO3 are mixed with 35 mL of 0.0500 M K2CrO4. (a) Calculate the concentrations of each species at equilibrium.
Use your experimentally determined value of ksp and show,by calculations, that Ag2CrO4 should precipitate when 5mL of 0.004M AgNO3 are added to 5mL of 0.0024 M K2CrO4.
One method used to store energy during times of low demand is by pumping water uphill into a reservoir. When energy demand exceeds the output produced by power plants
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