Give the safety measures when working with the following lab equipment during experiments and conduct of tests. • Equipment with Compressed gases • Water-cooled Equipment • Electrically powered equipment Stirring and heating devices (Oil, Salt, or Sand Baths, Ovens, Furnace) • High-pressure and high temperature equipment/vessel
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- The emission of NO, by fossil fuel combustion can be prevented by injecting gaseous urea into the combustion mixture. The urea reduces NO (which oxidizes in air to form NO2) according to the reaction: 2 CO(NH;)»(3) + 4 NO(3) + O2(8) 4 Na(8) + 2 CO;(g) + 4 H¿O(g) Suppose that the exhaust stream of an automobile has a flow rate of 2.55 L/s at 655 Kand contains a partial pressure of NO of 12.4 torr. What total mass of urea is necessary to react complete- ly with the NO formed during 8.0 hours of driving?Hydrogen peroxide solutions can easily be decomposed by dust, trace amounts of metals or light. It istherefore necessary to periodically determine the purity of the peroxide solutions.This can be done via a redox titration as follows: The density of a particular surgical grade hydrogen peroxide solution is 1.11g.cm-3. Exactly 10 mL of this solution was pipetted and quantitatively transferred, along with a sufficientamount of a dilute sulphuric acid solution, into a 250.00 mL volumetric flask and made up to the mark. A 25.00 mL portion of this diluted solution is pipetted into a conical flask, and titrated with a0.372 M KMnO4 solution. The endpoint of the titration is determined when the colourless solution in the conical flask turns apersistent bright pink due to the presence of excess permanganate ions. The average titration value is 26.20 mL of the KMnO4 solution 1.Determine the percentage of the hydrogen peroxide in the solution sample.2. Naturally occurring manganese…The amount of oil and grease from the rivers beside mining sites are quantified by solvent-solvent extraction. The dissolved oil and grease from the organic solvent will then be dried and weighed. What type of gravimetry is described by the statement? O precipitation gravimetry O physical gravimetry thermogravimetry electrogravimetry
- To remove the tarnish (Ag2S) on a silver spoon the following steps are carried out. the spoon is placed in a large pan filled with water so the spoon was totally immersed. A few tablespoonfuls of baking soda (sodium bicarbonate), which readily dissolves. Is added. Some aluminum foil is placed at the bottom of the pan in contact with the spoon and then heated the solution to about 80° After a few minutes, the spoon is removed and rinsed with cold water. The tarnish is gone and the spoon regains its original shiny appearance. Describe with equations the electrochemical basis for the procedure. Adding NaCl instead of NaHCO3 would also work because both compounds arestrong electrolytes. What is the added advantage of using NaHCO3? (Hint: Consider the pH of the solution.) What is the purpose of heating the solution? Some commercial tarnish removers containing a fluid (or paste) that is a dilute HCl solution. Rubbing the spoon with the fluid will also remove the tarnish. Name two…PLEASE SHOW ALL POSSIBLE STEPS OF WORK IF POSSIBLE<<< THANK YOU SOOOO MUCH<<< A solution is prepared by mixing 200.0 g of water, H2O, and 200.0 g of ethanol, C2H5OH. Determine the mole fractions of each substance.b) Determine the standard enthalpy change and std. Gibbs free energy change of reaction at 400 k for the reaction Co(g) +2H2(g) → CH;OH (g) At 298.15 K, AH?.co )= -26.41 kcal/mol, AH?.CH,OH()= -48.08 kcal/mol, AG.co )= -32.8079 kcal/mol, AG.CH,OH(@)= -38.69 kcal/mol, The standard heat capacity of various components is given by. CS = a + bT + cT2 + dT³, where C is in cal/mol-K and T is in K |Component b x10 e x105 d x10° a -0.291 CH3OH CO 4.55 2.186 -1.92 6.726 0.04 0.1283 -0.5307 H2 6.952 -0.0457 0.09563 -0.2079
- In the standardization of HCl using pure anhydrous sodium carbonate as the primarystandard for methyl orange as an indicator, 1.0 mL HCl was found to be equivalent to 0.05gof sodium carbonate (MW =106). The normality of HCl is:A solution is prepared by dissolving 10 g (NH:):SO4 in enough water to make 100.0 mL stock solution. A 11.00-mL sample of this stock solution is then placed in a 50.00-mL volumetric flask and diluted to the mark with water. What is the molarity of the new solution? (MW of (NH.)»SO« = 132.14 g/mol) %3D7) Br heat + CH;CO,H (solvent acetic acid)
- A geochemist in the field takes a 9.0 mL sample of water from a rock pool lined with crystals of a certain mineral compound X. He notes the temperature of the pool, 15. C, and caps the sample carefully. Back in the lab, the geochemist first dilutes the sample with distilled water to 400. mL.. Then he filters and evaporates all the water under vacuum. Crystals of X are left behind. The researcher washes, dries and weighs the crystals. They weigh 0.045 g. Using only the information above, can you calculate the solubility of Xin water at 15.° C7 If you said yes, calculate it. Be sure your answer has a unit symbol and 2 significant digits. yes O no 0 0.9 H ロ・ロ X 0 GB. DETERMINATION Molarity of nitric acid, M Volume of nitric acid, mL Molarity of sodium hydroxide, M Volume of sodium hydroxide, mL Initial Temperature (°C) Temperature of mixture (°C) 30 10 30 60 90 120 150 180 210 29 28 27 26 25 Time (sec) 1.00 5.00 26.7 Temperature of mixture (°C) vs. Time (sec) 0 29.0 29.0 OF THE ENTHALPY OF REACTION OF NITRIC ACID AND SODIUM HYDROXIDE 1.00 10.00 Temperature of mixture (°C) 26.7 27.8 29.0 29.0 29.0 29.0 50 Final Temperature (°C) AT (°C) AH (J/mol) AH (kJ/mol) 100 Time (sec) 150 200Q1 (a) Read the following sentences carefully and briefly justify the answer: (i) At STP 22.4 liter of O2 and Cl2 gas will have same number of molecules. (ii) Combustion of CH4 gas do not produces carbon rich sooty flame. (ii) Standard Hydrogen Electrode (SHE) is used to measure standard potential of electrodes. Hot water in a closed lid steel bowl is a closed thermodynamic system. (iv)