59. A sample of helium gas has a volume of 5.0 L at 27 °C an… 59. A sample of helium gas has a volume of 5.0 L at 27 °C and 1.0 atm. What will its volume be at 127 °C and 1.0 atm? Read Details
4. Which molecules are best explained by resonance in MO the… 4. Which molecules are best explained by resonance in MO theory? Read Details
57. What is the molar concentration of OH⁻ in a solution wit… 57. What is the molar concentration of OH⁻ in a solution with pOH = 4.0? Read Details
65. If a galvanic cell produces a current of 2.0 A for 1.0 h… 65. If a galvanic cell produces a current of 2.0 A for 1.0 hour, how many moles of electrons are transferred? (Faraday’s constant = 96,500 C/mol e⁻) Read Details
62. A first-order reaction has a half-life of 20 minutes. Ho… 62. A first-order reaction has a half-life of 20 minutes. How long will it take for 75% of the reactant to decompose? Read Details
74. What is the pH of a 0.0010 M HNO₃ solution? 74. What is the pH of a 0.0010 M HNO₃ solution? Read Details
55. How many grams of KCl (molar mass = 74.5 g/mol) are need… 55. How many grams of KCl (molar mass = 74.5 g/mol) are needed to prepare 250 mL of a 2.0 M solution? Read Details
46. If 10.0 g of aluminum reacts with excess hydrochloric ac… 46. If 10.0 g of aluminum reacts with excess hydrochloric acid, how many liters of hydrogen gas are produced at STP? (Reaction: 2Al + 6HCl → 2AlCl₃ + 3H₂) Read Details
