The density of liquid benzene, C,H, is 0.879 g/cm at 15 °C. How many moles are there in 36.5 mL of benzene at 15 °C? Select one: a. 2.43 mol b. 0.411 mol C. 0.467 mol d. 0.532 mol
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- The aluminum in a 1.200 g sample of impure ammonium aluminum sulfate was precipitated with aqueous ammonia as the hydrous Al(OH)3.xH2O. The precipitate was filtered and ignited at 10000C to give anhydrous Al2O3 which weighed 0.1798 g. Express the result of this analysis in terms of % Al2O3.In a 15-cm. evaporating dish is placed 15.4 g. (0.10 mole) of finely powdered biphenyl (Note 1). The dish is set on a porcelain rack in a 30-cm. desiccator with a 10-cm. evaporating dish under the rack containing 39 g. (12 ml., 0.24 mole) of bromine. The desiccator is closed, but a very small opening is provided for the escape of hydrogen bromide (Note 2). The biphenyl is left in contact with the bromine vapor for 8 hours (or overnight). The orange solid is then removed from the desiccator and allowed to stand in the air under a hood for at least 4 hours (Note 3). At this point, the product weighs about 30 g. and has a melting point in the neighborhood of 152°. The crude 4,4'-dibromobiphenyl is dissolved in 75 ml. of benzene, filtered, and cooled to 15°. The resulting crystals are filtered, giving a yield of 23.4– 24.0 g. (75–77%) of 4,4'-dibromobiphenyl, m.p. 162–163° (Note 4). How large of a scale can this reaction be run safely? Is it expensive?A student performed the experiment described in this module, using 7.00 mL of a 1.8% H2O2 solution with a density of 1.01 g mL-1. The water temperature was 20 ° C, and the barometric pressure in the laboratory was 30.02 in. Hg. After the student immersed the yeast in the peroxide solution, she collected 45.1 mL of O2. (11) Calculate the percent error for the experiment. What is the observed molar volume?
- Is it necessary to know [E]T to determine (a) KM, (b) Vmax, or (c) kcat?A sample may contain any combination of sodium hydroxide, sodium carbonate and sodium bicarbonate with inert matter. A 3.00g sample requires 57.57ml of 0.5N hydrochloric acid to reach phenolphthalein endpoint and a total of 105.4ml of acid was used until the methyl orange endpoint was reached. What is the percentage inerts in the mixture? What is the percentage sodium bicarbonate in the mixture? What is the percentage sodium hydroxide in the mixture? What is the percentage sodium carbonate in the mixture?Convert 370 ppm of CO2 to μg/m3 at 20oC and 101.325 kPa. Convert 80 μg/m3 of SO2 to ppm at 25oC and 101.325 kPa.
- What is the mole fraction of magnesium nitrate, Mg(NO3)2, in an aqueous solution that is 5.549 wt % in magnesium nitrate? MW(Mg(NO3)2) = 148.315 g/mol. 5.834e-2 1.721e-1 7.080e-3 9.929e-1Boyle’s law for confined gases states that if the temperature is constant, pv = c, where p ispressure, v is volume, and c is a constant. At a certain instant the volume is 75 cubic inches, thepressure is 30 psi, and the pressure is decreasing at the rate of 2 psi every minute. What is therate of change of the volume at that instant?Use only the first decimal points (X.X) for atomic masses. R = 8.314 L*kPa/mole*K . In a reactor at 200.0 kPA and 401 L, hydrogen and oxygen combine by the following reaction:2H2(g) + O2(g) --> 2H2O(g)51.2 g of hydrogen and 392 g of oxygen are placed into the reactor. What is the limiting reagent? H2 or O2 What is the final temperature of the system in degree celsius?
- what is the correct volume of 2.5M PhMgBr in THF is needed to completely react with 1.5ml of methyl benzoate?you do not need to consider and excess and should calculate (and choose) the minimum amount as required by the reaction stoichiometry Enter your answer to one decimal place with the proper unit of measurement.Use only the first decimal points (X.X) for atomic masses. R = 8.314 L*kPa/mole*K . In a 2.50 L reactor at 27 *C, sodium oxide captures CO2 from the gas phase by the following reaction:Na2O(s) + CO2(g) --> Na2CO3(s)36.2 g of Na2O(s) and 26.1 g of CO2(g) are placed into the reactor. What is the limiting reagent? Na2O(s) CO2(g) What is the final pressure of the system? kPaUse only the first decimal points (X.X) for atomic masses. R = 8.314 L*kPa/mole*K . In a reactor at 200.0 kPA and 401 L, hydrogen and oxygen combine by the following reaction:2H2(g) + O2(g) --> 2H2O(g)51.2 g of hydrogen and 392 g of oxygen are placed into the reactor. What is the limiting reagent? H2 or O2 What is the final temperature of the system?