How many mL of 0.760 M K2C2O4are needed to titrate 45.0 mL of 0.300 M Ca(MnO4)2?
7 4.(12 pts) A 3.195-g sample of a compound of formula FeClxwas dissolved in water. An excess of AgNO3was added to the solution, and all the chloride precipitated as AgCl (molar mass = 143.3). If the mass ofthe AgCl precipitate was 7.225 g,(a) Determine the masses of Fe and Cl in the original sample.(b) Determinex.Part 2. Multiple choice (use answer card). 60 pts. total. 3 pts. each. 20 questions.Indicate theBESTanswer for the questions in this section by completely filling in the appropriatespace on the answer card with a #2 pencil. Mark only one space per question.1.Which of the following isnota REDOX reaction?a.Cl2+ 2OH–àCl–+ClO–+ H2Ob.CuO + H2àCu +H2Oc.H++ NH3àNH4+d.H2+ O2àH2Oe.Ca+ F2àCaF22.Determine the oxidation number of Cr in Li2CrO4a.6+b.5+c.4+d.3+e.2+3.Calculate the number of grams of NaF (molar mass = 42.0) required to prepare 350 mL of a 2.50M solution.a.2.50b.105c.48.0d.0.875e.36.8
8 4.How many mL of 0.300 M Ba(OH)2are required to titrate 30.0 mL of 0.250 M HClO4?5.A mixture of gases contains 0.250 mol N2, 0.200 mol O2, and 0.100 mol Ne. If the total pressure ofthe mixture is 1.20 atm, the partial pressure of O2(in atm), is6.Consider the pictured cylinder with a movable piston. It containsnmoles of an idealgas at a certain temperature and external pressure. If the temperature is reduced by afactor of 4 and the external pressure is reduced by a factor of 2, the piston should7.H2diffuses 6.0 times faster than an unknown gas. Determine the molar mass of the unknown gas.a.12b.72c.25d.36e.3.08.A compound has the empirical formula CH2. At 430 K, 0.150 g of the gas occupies a volume of0.126 L and exerts a pressure of 1.00 atm. The molecular formula of the gas is9.Which of the following gases will have thegreatestdensity at the same specified temperatureand pressure?
9 10.A certain amount of gas at 298 K and a pressure of 0.800 atm is contained in a glass vessel.Suppose the vessel can withstand a pressure of 2.00 atm. How high can you raise the temperature(in K) of the gas without bursting the vessel?
You've reached the end of your free preview.
Want to read all 17 pages?