Csm Chem 210 Final

If the fuel efficiency of an automobile is 22 miles per gallon, what is its fuel efficiency in Kilometers per liter? ( 1Km= 0.621 mile, 1.00 L=1.057 quarts and 4 quarts = 1 gallon) - correct answer 9.4 Km/L *What is the correct answer to the following expression: (49.1 - 42.61 ) x 13.1? - correct answer 85 An intensive property of a substance is independent of amount. - correct answer True Lithium has two stable isotopes with masses of 6.01512 amu and 7.01600 amu. The average atomic mass of Li is 6.941 amu. What is the percent abundance of each isotope? - correct answer 7.493% Li-6 and 92.51% Li-7 C3H8 + O2 -- CO2 + H2O (unbalanced) How many grams of oxygen are required to burn 36.0 grams of C3H8? - correct answer 131 g *There are __________ mol of bromide ions in 0.500 L of a 0.500 M solution of AlBr3 - correct answer We put 0.250 - WRONG FIGURED OUT 0.75 Aluminum reacts with chlorine to produce aluminum chloride. If 2.00 moles of Al reacts with excess Cl2, how many grams of AlCl3 can be formed? Al + Cl2 ----- AlCl3 . ( unbalanced) - correct answer 266 g A mixture of MgCO3 and MgCO3.3H2O has a mass of 2.883 g. After heating to drive off all the water the mass is 2.427 g. What is the mass percent of MgCO3.3H2O in the mixture? - correct answer 40.4 A precipitation is expected when an aqueous solution of sodium iodide is added to an aqueous solution of - correct answer Mercury(I) chloride For the reaction Pb(s) + PbO2(s) + 2 H+(aq) + 2HSO4-(aq) --2PbSO4(s) + 2H2O(l) The oxidizing agent ( be specific) is ________ - correct answer Pb in PbO2 Based on the equations below, which metal is the least active? Pb(NO3)2(aq) + Ni (s) -- Ni(NO3)2 (aq)+ Pb(s) Pb(NO3)2(aq) + Ag(s) -- No reaction Cu(NO3)2(aq) + Ni(s) -- Ni(NO3)2(aq) + Cu(s) - correct answer Cannot be determined Calculate the molarity of the solution that contains 40.0 g of NaOH in 100. mL of solution - correct answer 10.0 M *What volume of 0.150 M H2SO4 is required to titrate 50.0 mL of 1.00 M NaOH? - correct answer 167 mL How many chloride ions (Cl-1) are present in 83.6 g FeCl3? - correct answer I put 3.10 x 10^23 - WRONG FOUND 9.31 x 10^23 Which of the following particles will not be deflected by charged plates? - correct answer γ (gamma) particle TO KNOW: alpha particle = positive beta particle = negative gamma particle = no charge alpha flow towards negative side beta flow towards positive side SO, the gamma (neutral) particle is answer 0.314 g of oxalic acid dihydrate (MM = 126 g/mole) is neutralized by 28.5 mL NaOH solution. Find the concentration of NaOH. H2C2O4 + NaOH -- Na2C2O4 + H2O (unbalanced) - correct answer 0.175 M What is the percentage of mass of oxygen in the compound C8H8O2? - correct answer 23.5% *A sample of 16.0 g of ozone, O3, contains the same number of atoms as - correct answer I put: 40.0 g of aluminum - WRONG R put 16.0 g Sulfur - WRONG Don't know right answer If 100.0 g of O2 are mixed with 20.0 g of H2 and the mixture is ignited, what mass of water is produced? - correct answer 113 g When 0.926 g of a metal oxide is heated, the compound decomposes in the reaction shown below. 2 M2O(s) -- 4 M (s) + O2(g) If 0.06390 g O2 is produced, what is the identity of the metal? - correct answer Ag *Which of the following is a nonelectrolyte in aqueous solution? - correct answer I put HF - WRONG maybe ethanol - C2H5OH Don't know correct answer Which of the following is not correctly matched - correct answer ZnO zinc (II) oxide Which of the following statements is false - correct answer All redox reactions are also single displacement reactions *A solution of acetic acid, CH3COOH is 60.0 % by mass and has a density of 1.10 g/mL. Calculate the molarity (M) of the solution. - correct answer 11.0 M Nitrogen dioxide (NO2) is a gas that enters the atmosphere principally from natural fertilizer breakdown. Some studies have shown that the isotope ratios of N-15( 15N) to N-14 (14N) and of O-18( 18O) to O-16 (16O) in NO2 depend on the source, which can thus be determined by measuring the relative abundance of molecular masses in a sample of NO2. What molecular masses are Not possible for NO2? - correct answer 52 *A unknown compound contains only carbon, hydrogen and oxygen. Combustion of 1.00 g this compound will produce 0.4093 g H2O and 1.499 g CO2. What is the empirical formula of this unknown compound? - correct answer C3H4O3 What is the net ionic equation for the reaction of sodium hydroxide with iron (III) nitrate? - correct answer Fe3+ (aq) + . 3 OH- (aq) -- Fe(OH)3(s) You mix 50.0 mL of 0.165 M AgNO3 with 25.0 mL of 0.302 M KCl. What is the mass of the precipate that can be formed - correct answer 1.08 g One of the outermost electrons in a strontium ( Sr) atom in the ground state can be described by which of the following sets of four quantum numbers? - correct answer 5,0,0,1/2 NO2 is a known air-pollutant resulting from the combustion of petroleum in vehicles. Suppose at 6:00 am, there are 0.920 ppm NO2 in a liter of air. Calculate the mass (in grams) of the NO2 present in a liter, assuming there are 2.46 x 1023 molecules of air in 1.00 L. - correct answer 1.73 x 10^-5 At 20°C, sample of gas has a volume of 2.51 L at 795 torr. What is the new pressure (in atm) if the volume is increased to 3.23 L at the same temperature? - correct answer 0.813