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What volume of 0.172 M Na3PO4 solution is necessary to completely react with 88.7 mL of 0.117 M CuCl2? 74 kg student runs up the stairs in the time 13 s . The height of the stairs is 13 m . What is his power output? If f(t) + t^-2, find f'(1) using the limit definition of derivative.? Which element is [Ar]4s2? Chemistry problem someone help solve please?