Answer Happy

19. How many oxygen atoms are there in 5.68 g of Al2O3? a. 1.67x10¹ atoms c. 1.0x1023 atoms b. 1.01x102 atoms d. 3.35x1022 atoms 20. What is the mass percentage of H in 1 mole C₁4H,Cls? a. 25.6% b. 39.60% c. 2.56% d. 50.0% 21. HF is an example of a strong electrolyte. Tor F 22. Which of the following is (are) example(s) of a weak electrolyte? a. H₂SO4 d. HCN b. NH c. KOH e. a and b f. b and d 23. A reaction that takes place in an aqueous solution and results in the production of solid substance is an example of a reaction. 24. A Bronsted-Lowry acid/base reaction is best defined as: a. a combination reaction c. a loss of a proton b. a redox reaction d. a proton transfer reaction 25. A triprotic acid has_ a. many b_2 c. 3 acidic protons. d. 4 e. d 26. The gas formed when CaCO3 reacts with HCI is: a. CO₂ c. H₂CO3 d. Cl₂ b. CO₂ 27. What are the oxidation states of each element in CIO,? a. Cl-+5, 0-2 b. Cl-+7, 0-2 c. Cl=-5,0--2 d. Cl +5, 0=+2 28. The molarity of a solution of NaOH if 5.00 g of NaOH is dissolved to a final volume of 501 mL is 29. Which statement is not true of the first law of thermodynamics: a. the total amount of energy remains the same b. energy may not be converted from one form to another c. energy may be converted from one form to another d. energy is neither created or destroyed