Problem set #2 Salah S. MassoudPart-II:Chem 107Problem set #2 Salah S. MassoudPart I: Multiple Choices. Please circle the ONE best answer:1. The number of ions formed when Al(NO3)3 is dissolved in water is:a) 13 b) 3 c) 2 d) 42. What volume of 0.650 M HCl is needed to completely neutralize 12 g of NaOH (40.0 g/mol)?a) 462 mL b) 0.462 mL c) 18.5 mL d) 11.0 mL3. Which of the following species is a weak acid in water?a) HCl b) NH3 c) HC2H3O2 d) HNO34. For the reaction: Mg (s) + H2SO4 (aq) MgSO4 (aq) + H2 (g), the spectator ion(s) are: a) Mg2+ and Cl- b) Mg2+ and H+ c) SO42- and H+ d) only SO42- 5. If a student accidentally mixed 400. mL of 0.35 M HCl with 100 mL of 0.65 M HCl. What would be the final molarity of hydrochloric acid solution? a) 1.0 M b) 0.41 M c) 0.35 M d) 0.65 M6. Calculate the molarity of 0.105 g of backing soda (NaHCO3, molar mass = 84 g/mol) in 2.5 mL of solution.a) 0.042 M b) 5.0 x 10-4 M c) 0.05 M d) 42 M7. For the reaction: CaCO3 (s) + 2 HCl (aq) CaCl2(aq) + CO2 (g) + H2O (l)The net ionic equation isa) CO32- + 2 H+ H2O (l) + CO2 (g)b) CO32- + 2 H+ H2CO3 c) CO32- + H+ HCO3- d) CaCO3 (s) + 2 H+ Ca2+ + CO2 (g) + H2O (l)8. Which of the following is a weak electrolyte:a) potassium chloride (KCl) b) hydrobromic acid (HBr) c) aqueous ammonia (NH3) d) Nitric acid (HNO3)9. For the reaction: 2 Al (s) + 3 H2SO4 (aq) Al2(SO4)3 (aq) + 3 H2 (g), the spectator ion(s) are: a) Al3+ and SO42- b) Al3+ and H+ c) SO42- and H+ d) only SO42-10. If 380.0 mL of 0.350 M NaOH is added to 250.0 mL of 0.65 M HNO3, will the mixture be a) acidic b) basic c) neutral d) amphoteric11. Which of the following equations DO NOT represent an oxidation?1a) MnO2Mn2+a) SO2 SO3 b) Zn Zn2+c) 2 I- I2 (l)12. The oxidation numbers for arsenic in AsO43- and As2O3 are:a) +5 and +3, respectively b) +5 and +6, respectivelyc) +5 and -6, respectively d) –3 and 0, respectively.13. In the reaction: H2S (aq) + 4 Br2 (aq) + H2O (l) H2SO4 (aq) + 8 HBr (aq), the oxidizing agent is a) H2S b) Br2 c) H2O d) H2SO414. The oxidation numbers of sulfur, S in H2S and S2O42- are:a) -2 and +3, respectively b) -2 and +6, respectively c) +2 and +3, respectively d) –2 and +8, respectively 15. Calculate the molarity of F- in a 250.0 mL solution containing 18.34 g LiF and 4.32 g NaF? a) 0.810 b) 0.202 c) 4.77 d) 3.24Part II: Chemical equations and formulas:1. Balance the following ionic redox reaction in acidic medium:Cr2O72- (aq) + SO2 (g) Cr3+ (aq) + SO42- (aq)Then indicate:a) The oxidation step: -----------------------------------------------------b) The reduction step: -------------------------------------------------------c) The oxidizing agent: -------------------------------------------------------d) The reducing agent: -------------------------------------------------------- e) The number of electrons that is transferred per mole of the reducing agent: ------------2. Write balanced chemical equations for each of the following. Including physical states as (s, l, g aq) and be careful about the type of arrow you use as or (Use the periodic chart for charges on each ion. Use reference sheet).a) Write the equation which represents what happened when Na2CO3 is dissolved in water:b) Write the equation (if any) of a solution of KNO3 with a solution of Na2CO3.c) Write the NET IONIC equation for the reaction of Na2CO3 (aq) with CaCl2 (aq) Part III Show all work for full credit. Please express all answers with proper units and correct number of significant figures.21. What volume in milliters of 0.1234 M HCl is needed to neutralize 2.00 g Ca(OH)2 (74.1 g/mol)?2. The density of ethanol, C2H6O, is 0.789 g/mL. Calculate the number of moles of 25.0 mL ofC2H6O?3. How many grams of HCl are needed to react with 6.25 g of Al according to: 2 Al (s) + 6 HCl(aq) 2 AlCl3 (aq) + 3 H2 (g)4. Exactly 20.0 g of SiO2 and 7.00 g of C are allowed to react according to the balanced equation:SiO2 (s) + 3 C (s) SiC (s) + 2 CO (g)a. What is the maximum amount of carbon monoxide that can be formed?b. If you perform the experiment and isolate 4.50 g CO, what is the percent yield?5. Consider the following reaction:2 Cr (s) + 3 Br2 (l) 2 CrBr3 (s)a. How many grams of bromine are required to react completely with 10.00 g of chromium?b. How many grams of chromium and bromine are required to produce 29.17 g of CrBr3? 6. The density of liquid bromine is 3.10 g/mL. What volume of bromine will be required to reactwith 5.87 g of aluminum according to the equation below?2 Al (s) + 3 Br2 (l) Al2Br6 (s)7. A chemist mixes 80.0 g of manganese(IV) oxide with 100.0 g hydrochloric acid under conditionsfor the following reaction:MnO2 (s) + 4 HCl (aq) 2 MnCl2 (s) + Cl2 (g) + 2 H2O (l)a. What is the maximum number of grams of Cl2 that can be produced?b. Which reagent will be totally consumed (limiting reactant)?c. What is the percent yield of the reaction, if 44.7 g of Cl2 is produced?8. Peroxyacylnitrate is one of the components of smog. It is a compound of C, H, N, and O. It has the following percent composition by mass: 19.8% C, 2.59% H, 11.6% N, and 66.0% O.a. Determine the simplest formula of the compound.b. What is the molecular formula of the compound if its molar mass is about 121 g.9. You can dissolve an aluminum soft drink can in an aqueous base such as potassium hydroxideaccording to the reaction: 2 Al (s) + 2 KOH (aq) + 6 H2O (l) 2 KAl(OH)4 (aq) + 3 H2 (g) If you place 12.55 g of Al in a beaker with 250. mL of 1.29 M KOH, will any Al remain after thereaction has taken place? What mass of KAl(OH)4 is produced?Answers:3Part I-Multiple Choices: 1) d