Which of the following electron configurations is/are correct? 1.  Ag: [Kr]5s24d9 2.  Cu:[Ar]4s13d10 3.  Mn:[Ar]4s23d5

Which of the following statements is/are correct?  ( 4, 3, -1, +) is a valid set of quantum numbers (3, 2, 0, -) is an electron set for an electron in a 3d orbital ( 1, 1, 0, +) is a valid set  of quantum numbers

What is the energy in joules of 3 moles of photons with a wavelength of 7.91 mm? 

What volume (mL) of 0.0315 M barium hydroxide (Ba(OH)2) is need to reach the equivalence point when you have 275.0 mL of 0.165 M  perchloric acid (HClO4)?

Which of the following statements is/are true? HClO2 is a strong acid MgH2(aq) is a strong base HBr (aq) is a strong acid

Which of the following electron configurations is/are correct? 1.  Mo: [Kr]5s24d4 2.  Cr:[Ar]4s13d5 3.  Co:[Ar]4s23d7

A researcher runs an experiment that produces 120.5 g of aluminum sulfate when adding 22.5 g of aluminum to excess sulfuric acid according the the following equations.  What is the percent yield of the reaction?  2Al(s) + 3H2SO4(aq) 

What is the molarity of a solution made by mixing 5.25 g of potassium chlorate, KClO3 in enough water to make 285.00 mL of solution?

Which statement is/are correct regarding an aqueous mixture of Pb(NO3)2 and HBr? i.  The net ionic equation would be:  Pb2+ + Br- –> PbBr2 (s) ii.  lead would be a spectator ion iii.  NO3– would be a spectator ion

A saline solution is prepared by mixing 16.926 g of NaCl into enough water to make 195.00 mL of solution.  275.00 mL of water is then added to the first solution.  What is the concentration of the final solution?