Question

6. 48.6 mL of a 0.100 M NaOH solution is needed to react with 20.0 mL of an unknown concentration of HCl solution. What is the concentration of the HCl solution? 7. A colorless liquid has a composition of 84.1% carbon and 15.9% hydrogen by mass. Determine the empirical formula. Also, assuming the molar mass of this compound is 114.2 g/mol, determine the molecular formula of this compound. 8. What is the concentration of HCl in the final solution when 65 mL of a 12 M HCl solution is diluted with pure water to a total volume of 0.15 L? 9. How many milliliters of 0.260 M Na2S are needed to react with 40.00 mL'of 0.315 M AgNO3? 10. If 100. mL of 0.400 M Na2SO4 is added to 200. mL of 0.600 M NaCl, what is the concentration of Na+ ions in the final solution? Assume the volumes are additive. 11. The balanced equation for the gaseous state oxidation of ammonia is shown below. 4NH3 + 502 → 4NO + 6H20 How many moles of O2 are required to react with 1.2 mole of NH3? 12. The balanced equation for the decomposition of water is shown below. 2H20 - 2H2 + O2 If 0.72 g of water react completely in this reaction, what is the theoretical yield of H2? 13. Balance the chemical equation given below, and determine the number of moles of iodine that reacts with 30.0 g of aluminum Al(s) + - 12(s) →Alzle(s) 14. How many anions are there in 2.50 g of MgBrz? 15. What is the mass of 0.500 mol of dichlorodifluoromethane, CCl2F2? 16. What is the empirical formula of a substance that contains 2.64 g of C, 0.444 g of H, and 3.52 g of O?

Answer 1

6) Reaction between Naot & Hel is NaOH + Hel - Nach + H₂O Min = M2 z C 20ml M, Molasity of Hu: 2 M₂ : Molarity of North = 0.1M v : volyme of Hy = 20m ₂ = volume of Naoth = 48.6 m on = No. of moles of Hel=1 M2 Number of moles of Noot1 = 1 Mi - Masam 0-1X48-6m = 0.243M Molarity of He: 0.243M 7) Element, Mass, mass of 1 no. of moles I Simple saho Carbon 12 84.1 | 84 : 1 = 7.0 / 18 / 2 = 1 4 Hydrogen 15.9 / 159 159 159 7 = 2.26 ~9. Emperical formula: Cata Molecular formula & E.Fn Molar mas of compound 114.2 g/mol Emperical formale mais 4X1249 2. = Molecules formule = ( 49 - Ce Hig 8 Diluhon formule is Miv, = May M, Molarity of ty 65 mL X 12 M = M2 x 15ome before deluhen: 129 M = 65mL X12 - 5 150mL - 5.2 M. v volume of ity: 65 me z fund volume of so: 0-152 Mr = 2

6) Reaction between Naot & Hcl is NaOH + Hol Nach + H₂O Miv _ M₂ V2 M, - n n - M: olasity of H = ? 1 M₂ : Molarity of Nooth = 0.1M v volyne of Hy = 20m = volume of NaoH= 48.6m n = No. of mokes of Hel=1 m₂ = Number of moles of Nooth = 1 - M2V " _ 0.1x48-6m I 2ome - 0.243M Molarity of Hy: 0.243M 7) element, mais, mass of no. of moles | Simple taho Carbon 12 34. 1 84. 1 = 7.0/16 - 7 -7 4 Hydrogen 15.9 159 15.9. 159 - 2.26 ~9. Emperical formula. Catta Molecular formula & E.Fn Molar mass of compound 114.2 g/mol Emperical formale mass 4x1249 = 2. Molecules formale - Cu Ha). - C H18 8) Diluhon formule is MV, = MzY M, Molarity of Hy 65 mL X 12 M = M₂ X 15ome 65m x 12 – 5-2 before deluchen: 129 M₂ = 6 M. - 150mL - volume of itu: 650 - find volume of sost: 0.152 Mr = 2