- Which quantam number determines the main energy level of an atom?

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What is the chemical equation of xylene??? (balanced)? HELP! i need a balance equation of Xylene reacting with water (chemical reaction). What is it?? And please describe why.? Calculate the mass (g) of 3.13 x 1012 moles of S? The non-permissible value(s) for the rational expression (2x^2-x-1)/ (4x^2-3x-1)? Simplify the rational expression (x-5) - (x^2-6x +8) X (x^2+3x +2)/ (x-7) - (x^2+8x +7) X (x^2- 11x +28) identify all non permissible values?