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If oxygen gas were collected over water at 22 C and the total pressure of the wet gas were 650 mm Hg, what would be the partial pressure of the oxygen?
How many grams of MgCl2 would be needed to prepare 2.000 L of a solution that is 197 ppm in Mg2+ ions. Note: there is one Mg2+ ion in every MgCl2.
A solution of water and a nonvolatile, nonionizing compound is placed in a tube with a semipermeable membrane on one side. the tube is placed in a beaker of pure water. What initial net effect will occur?
An electron is confined to a one dimensional box of length L. It falls from the second energy level to the ground state, and releasee a photon with a wavelength of 322 nm
a cylinder of He gas has a volume of 25.0L at 22 degrees C and 5.6atm. How many moles of He are in such a cylinder?
Before investigating the scene, the technician must dilute the luminol solution to a concentration of 6.00×10^?2 M . The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are prese..
What is the molarity of ZnCl2 that forms when 30.0 of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL . Zn+ CuCl2=ZnCl2+Cu.
How many atomsof carbon are present in 34.5 grams of caffeine?
the explosive tnt is composed of 37.0 carbon 2.2 hydrogen 18.5 nitrogen and the rest oxygen. if the molar mass of tnt
Considering the two resonance structures of the conjugate base of saccharin, which atom (N or O) bears more of the negative charge. explain why.
The molecules CH4 and CH3Cl both have tetrahedral shapes. Why is CH4 nonpolar whereas CH3Cl is polar
The reversible chemical reaction has the following equilibrium constant: Kc=[C][D]/[A][B]=7.0 Initially, only A and B are present, each at 2.00 M .
The ideal gas law (for one mole of gas) may be used to express pressure as a function of volume and temperature, ie p=p(V,T). Use this and the expression for the above total differential of G to obtain expressions for the partial derivatives natur..
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