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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?

32. A gas occupies 4.0 L at 1.0 atm. If pressure increases to 2.0 atm at constant temperature, what is the new volume?

54. What is the wavelength of light emitted when an electron in hydrogen falls from n = 3 to n = 2? (Rydberg constant R = 1.097×10⁷ m⁻¹)

10. The difference between empirical and molecular formulas is: