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How many valence electrons does the element with an atomic number of 113 have? Solve: the quotient of a number and 15 minus twelve is negative six.? Calculate the pH of a 1.75 M H2SO4 solution.? If 4.0 L of a 5.1 M SrCl2 solution is diluted to 50 L , what is the molarity of the diluted solution? A brick falls freely from a 10.5m-high scaffold?