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How many isomers are possible for [Zn(gly)2] (tetrahedral)? - express as an integer.? How much energy (in J) is contained in 1 mole of photons with a wavelength of 44 cm? pleaseeeee give the answer in two sig figs , urgent? How you can quickly calculate the mean of the following test scores without adding the numbers. 76,73,78,75? Hello, can anyone tell me what crystals/ minerals these are? I notice the purple amethyst and rose Quartz? Not sure about the others. Thank? A metal sphere has a charge of +8.9C. What is the net charge after 7.8 x 1013 electrons have been placed on it?