Chemistry question and answers for July 25, 2023
- Q A sample of gas contains 0.1600 mol of CH4(g) and 0.1600 mol ofH2O(g) and occupies a volume of 12.1 L. The following reactiontakes place: CH4(g) + H2O(g)-----3H2(g) + CO(g) Calculate...
- Q What volume, in liters, of 1.04 M KOH solution should be addedto a 0.107 L solution containing 9.26 g of glutamic acidhydrochloride (Glu, FW = 183.59 g/mol; pKa1 = 2.23,...
- Q Determine the pH at the equivalence (stoichiometric) point inthe titration of 41 mL of 0.25 M C6H5COOH(aq) with 0.27 M NaOH(aq).The Ka of benzoic acid is 6.5 x 10-5.
- Q Rank each of the following compounds in decreasing order ofreactivity towards Friedel-Crafts alkylation. Most reactive = 1; ifa compound will not react, rank it as \"non\" rather than assigning anumerical...
- Q Calculate the solubility (in grams per 1.00×102mL of solution)of magnesium hydroxide in a solution buffered at pH = 12. Expressyour answer using two significant figures. I got S1 = 1.2×10^-8which...
- Q Lead is a toxic metal that affects the central nervous system. APb-contaminated water sample contains 0.0010 % Pb by massHow much of the water (in mL) contains 145 mg of...
- Q 1) In H NMR spectroscopy, why is the peak for a vinyl proton,C=C-H, shifted downfield relative to that of an alkane proton,C(sp3)-H? Be sure to use the following terms in...
- Q Table salt, NaCl(s), and sugar, C12H22O11(s), are accidentallymixed. A 3.50-g sample is burned, and 2.10 g of CO2(g) is produced.What was the mass percentage of the table salt in the...
- Q Agree or disagree with the following statements. Support youranswer with chemical reasoning, calculations, analogies, examples,etc.a. Since sugar is soluble in water, the lattice energy must begreater than the hydrogen bonds...
- Q Calculate the expected change in temperature for 25.00 mL of0.500 M HCl reacting with 25.00 mL of 0.500 M NaOH. The heatCapacity of the Calorimeter is 15.6 J C -1...
- Q How do you know when it is acceptable to assume a heatcapacity is constant and pull it outside of the integral?
- Q For the reactions shown below, we added 3.75 mL of 0.0420M Na2S to a test tube containing one of the twocations (Cu2+ or Cd2+) and recovered 0.0228 gof precipitate.Cu(NO3)2(aq) +Na2S(aq)...
- Q a. Write the chemical reactions whose equilibrium constants areKb and Ka for imidazole and imidazole hydrochloride,respectively.b. Calculate the pH of a solution prepared by mixing 1.00 g ofimidazole with 1.00...
- Q 3,4-benzopyene (BP, C20H12) is a toxic aromatic hydrocarbonfrequently found in polluted air. 5.0 liters of air (at standardtemperature and pressure) is bubbled through 10 ml of dilutesulfuric acid, capturing the...
- Q A single charcoal briquette has a mass of 0.1 kg, and is made upof almost entirely carbon. I want to burn that briquette in air ina sealed oven. When the...
- Q Consider the equilibrium reaction shown below, which is firstorder with respect to each [A], [B], [C], and [D].A + B = C + D with K1 for the forward reaction...
- Q In a reaction of Zn (0.53 g) & HCl what is the volume ofHydrogen gas generated? (assume atmospheric pressure)
- Q At a temp below room temp but with all components as gases, thedecomposition of iodine monochloride, ICl, to iodine and chlorine,is 1.4*10^-52ICl (g)----> I2 (g) + Cl2 (g)If a sealed...
- Q A mixture containing an initial concentration of 0.1726 M for H2and 0.1361 M for I2 is allowed to come to equilibrium (see reactionbelow). What must be the equilibrium concentration of...
- Q The enthalpy of a simple (and not particularly realistic) modelsystem is given byH = c1 TP + c2T2 /2where c1 and c2 are constants.1. Evaluate the partial derivatives (∂H/∂T)p and...
- Q 12. Consider the titration of 0.100 L of 0.200 M ascorbic acidwith 0.500 M NaOH. What is the pH at the endpoint of the titration?Enter your answer to two decimal...
- Q A window of a car is found to be covered with 0.9cm of ice. Ifthe area of the window is 1 m2, and the ice is at -12 degreesCelsius, what...
- Q Calculate the pH of a liter of 0.125 M ammonium perchloratesolution. (kb= 1.7 x 10-5)show ice chart!
- Q A 5.65 −g sample of a weak acid with Ka=1.3×10−4 was combinedwith 4.80 mL of 5.90 M NaOH and the resulting solution was dilutedto 750 mL. The measured pH of...
- Q Determine the pH of each of the following solutions.Part A) 0.25 M KCHO2Part B) 0.15 M CH3NH3IPart C) 0.22 M KI
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