What are the values of A-D that balance the following equation? (A)H2S+ (B)SO2 produces (C)Cs + (D)H2O O a. A = 2, B = 1, C = 3, D = 2 O b. A = 2, B = 2, C = 4, D = 2 O c. A = 2, B = 1, C = 3, D = 3 O d. A = 3, B = 1, C = 4, D = 2 1 Given the following two reactions: C(s) + O2(g) - CO2(g); AH = -393.5 kJ, 2Fe(s) + 3/2 02 (g) - Fe203 (s): AH = -824.2 kJ. Calculate the enthalpy change for 2Fe2O3(s) + 3C(s) - 4Fe(s) + 3CO2(g) a. 467.9 kJ O b. -467.9 kJ O c. -430.7 kJ O d. 430.7 kJ Given the reaction in a basic solution: MnO4-1 + C204 2- produces MnO2 + CO3 2-, how many water molecules and H ion were added both in reduction and oxidations reactions? O a. 2H20 and 5H ion O b. 2H20 and 4H ion O c. 2H20 and 2H ion O d. 2H20 and 3H ion 4

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5. When 5.0 moles of potassium metal reacts with an excess of H₂0, 3.5 g of H2 are produced. 2 K (s) + 2 H20 (1) 2 KOH (aq) H₂ (g) a. Calculate the number of moles of water needed to react with all of the potassium metal. (Ans: 5 mol) + b. Calculate the theoretical yield of H2, in grams, formed when all 5.0 moles of potassium metal are consumed. (Ans: 5.04 g) c. Calculate the percent yield of the reaction, given 3.5 g (actual yield) are produced. (Ans: 69.4%)

The solubility of Co (OH), in water at 25 °C is measured to be 6.4 x 10 -4 g -. Use this information to calculate K.. for ds. Со (ОН)2. Round your answer to 2 significant digits.

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In a closed system, equal amounts of ammonia and oxygen react to produce nitrogen monoxide and water. What is the limiting reactant? NH3 4NH3 + 502 - 4NO + 6H,0 NO H20 OO O

What are the correct reaction conditions for the following transformation?