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If and electron makes a transition from n=2 to n=1, what will be the wavelength of the emitted radiation?
n=2 --> 2322kjmol-1
n=1 --> 580.5kjmol-1
Elemental exonium (not a real element) consists of two major isotopes Abundance Mass 59% 94 amu 41% 112 amu What is the atomic weight for exonium? Answer in units of amu
an atom of a certain element has 20 electrons write the ground state configuration of the element
Iodine-131 is a radioactive isotope. After 7.00 days, 54.7% of a sample of 131I remains.
In the early days of the periodic table, the 1870s, both silicon and tin were known elements, but germanium was unknown. Using these trends and the densities of silicon and tin that you just obtained, estimate the density of germanium?
the reaction system pocl3g poclgcl2g is at equilibrium. which of the following statements describes the behavior of the
Solar furnaces are designed to focus sunlight (say, with a parabolic mirror ) onto a relatively small area. given that the surface temperature of the sun is about 600K.
A sample of 1.42 g of Helium and an unweighed quantity of Oxygen are mixed in a flask at room temperature. The partial pressure of Helium is 42.5 torr and of oxygen is 158 torr.
A reaction has a standard free-energy change of -14.00 kJ mol-1 (-3.346 kcal mol-1). Calculate the equilibrium constant for the reaction at 25 °C.
Transmittance, T, is defined as the intensity of light transmitted through a sample divided by the intensity of light incident on the sample. The absorbance, A, is defined as
what is the molarity of ions in a solution formed by dissolving 7.40 of the mixture in enough water to form 600.0 of
The equilibrium constant is 100. Calculate the concentrations of O2 present at equilibrium
At 55.0C, what is the vapor pressure of a solution prepared by dissolving 75.8 g of LiF in 265 g of water?
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