- Help!! i know how to solve this problem but i don't know what the system of equations would be.?

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Point charges of 5micro and -3micro charge are placed 0.250m apart.Where can a third charge be placed so that the net force on it is zero? How to calculate salvage value? Molar mass of Radon if mercury vapor diffuses 1.082 times as fast as radon gas? Assume that Graham's law holds for diffusion.? Which of these do not obey the octet rule?
ClO
ClO−
ClO2−
ClO3−
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