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55. How many grams of KCl (molar mass = 74.5 g/mol) are needed to prepare 250 mL of a 2.0 M solution?

30. When 4.0 grams of hydrogen gas react completely with oxygen gas, how many grams of water are produced? (Reaction: 2H₂ + O₂ → 2H₂O)

60. If 0.50 moles of electrons are transferred in a redox reaction, what is the total charge in coulombs? (Faraday’s constant F = 96,500 C/mol e⁻)

52. How many grams of NH₃ are produced when 17 g of nitrogen gas react with excess hydrogen? (Reaction: N₂ + 3H₂ → 2NH₃)

57. What is the molar concentration of OH⁻ in a solution with pOH = 4.0?

26. If 0.75 moles of hydrogen gas are contained in a 2.0 L vessel at constant temperature, what is the molarity of the hydrogen gas?

15. Enthalpy (ΔH) is:

7. Ionic bonds:

64. What is the cell potential for a galvanic cell where E°(cathode) = +0.80 V and E°(anode) = +0.34 V?

37. How many milliliters of 0.50 M HCl are required to neutralize 25.0 mL of 1.0 M NaOH?