Blog

9. A 5.0 g sample of liquid requires 150 J to increase tempe…

9. A 5.0 g sample of liquid requires 150 J to increase temperature by 10 °C. What is its specific heat capacity?

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⁻)

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?