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25)Which of the following best represents the 3-dimensional view of H2N–?

a) How many grams of MgCl2 are contained in 75 mL of a 5.30-M solution?

14) What is an appropriate set of 4 quantum numbers for the last electron in an atom of Au? [Au Atomic Number = 79]

31) Convert 35.0 mile/hour to meter/sec.     [1mile = 1.6094 km; 1km =1000 m; 1 hour = 60 min, 1 min = 60 sec]

41) Methane (CH4) is being considered for use as an alternate auto mobile fuel to replace gasoline. One gallon of gasoline could be replaced by 656 g of methane. What is the volume of 656 g methane at 25 °C and 745 torr? PV = nRT   [R = 0.08206 L. atm/mol. K]

35)  Calculate the mass of hydrogen formed when 25 grams of aluminum react with excess hydrochloric acid.                                                                                  2Al + 6H   Arrow-Single(12).png  Al2Cl6 + 3H2

34) How much 0.025 M nitric acid solution is needed to titrate 125.0 mL of a 0.0100 M calcium hydroxide solution? [Begin with writing the acid–base neutralization reaction.]

19) What salt is formed in the following acid/base reaction?                         HClO3 + Ba(OH)2    Arrow-Single(10).png  ????

24) A sample of real gas (such as CH4 or CO2) behaves most ideally at:

3) What is the Complete Ionic Equation for the reaction between cobalt (II) chloride and sodium hydroxide? What are spectator ions?