Zinc-air batteries are actively being researched because one reactant (oxygen) is provided in infinite supply for free. The standard cell potential for this battery is 1.65 V. If the cell potential is 1.61 V, what is the partial pressure of oxygen in the cell and a temperature is 25.0\deg C? The reaction in the cell converts Zn(s) and O2(g) into ZnO(s). 2Zn(s) 02 (g) -> 2ZnO(s)
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- A galvanic cell at a temperature of 25.0 °C is powered by the following redox reaction: 2+ 2+ Sn(aq) +Ba(s) → Sn (s) + Ba** (aq) 2+ 2+ Suppose the cell is prepared with 7.71 M Sn in one half-cell and 5.89 MBa in the other. Calculate the cell voltage under these conditions. Round your answer to 3 significant digits.A Br selective electrode is applied for measuring bromide ions in saline solution. Cl' ions were found to interfere, with a kPot = 0.0050. %3D After calibration, the ISE equation was determined to be y = -70 mV - 59.2mV*log(x). If we measure a potential of 93 mV, and the [CI]=0.100 M, what was the [Br'] in units of M? O 0.00821 O 0.100 O 0.0050 O 0.123 O Correct answer not found in other optionsNeutral sphingomyelinase 2 converts sphingomyelin into ceramide and phosphorcholine. What kind of enzyme is it? Assume Vmax is 35 µM min-1. When you provide 3.0 x 10-5 M of sphingomyelin, you observe an initial velocity of 6.0 µM min-1. Calculate the KM.
- SHOW COMPLETE SOLUTION 1. An electrochemical cell consist of 0.2715 Ibs of MnO2, and 0.2524 Ibs of PbO2. A current flow through a 1.1 ohm resistor of electrochemical cell for 45 mins. The reaction takes place at 400k and the total volume of the solution is 504.9 cm^3. Use the standard reduction cell potential table for MnO2 and PbO2: concentration of Mn2+ (2.81 M) and PbO2 (0.95 M) Cell Potential E=0.48 V current when it passes through a 1.1 ohm resistor = 0.44 ampere Determine the following: a. quantity of electricity/charge, Q b. Energy consumed in Joules c. Power in KilowattsExample The standard half electrode potential for Fe²+ vs SHE is 0.77 V. What is the value of Ee at T = 298K when: [Fe³+] = 0.2 mol l-1 [Fe2+] = 0.05 mol 1-1The energy of activation for the reaction 2 HI – H2 + I2 is 180. kJ•mol-1 at 544 K. Calculate the rate constant using the equation k = Ae-EalRT. The collision diameter for HI is 3.5×10-8 cm. Assume that the pressure is 1.00 atm. 4.0 4.510e-27 X M-1.s-1
- Phosphate buffered saline (PBS) is a physiological buffer often used in biology experiments. Because the concentrations are very low and small amounts are difficult to weigh out, it is often prepared as a 10X stock solution meaning that it is prepared at 10 times the working concentration which is 1X. 1X PBS is made up of Na2HPO4 10 mM (MW 141.9 g.mol-1); KH2PO4 8 mM (MW 136.08 g.mol-1), NaCl 137 mM (MW 58.44 g.mol-1) and KCl 74.5 mM (MW 74.5 g.mol-1). You decide to prepare a 1 L 10X solution of PBS. What is the Molar (M) concentration of each of the components in you 10X stock. Write your answers in the table below. How much of each of the components should you weigh out to prepare 1L of the 10X stock solutions. Write your answers in the table below.Hexokinase in red blood cells has a Km of approximately 50 µM. What concentration of blood glucose would yield a velocity equal to 90 % Vmax? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a 500 mM 0.0450 mM 4500 μΜ 5000 µM e 5.0 mM 0.50 mM 450 μΜ 4.5 mM 50 μΜ.A 2.0% (by mass) aqueous solution of novocainium chloride (C13 H21 CIN2O2) freezes at -0.235 °C. a Calculate the van't Hoff factor, i. - Kp (H2O) = -1.86 °C/m. i = b How many moles of ions are in the solution per mole of compound? mol ions
- A flat (not spherical) tissue engineered skin (thickness 3.9 mm) is attached to the bottom of a dish and cultured with cell media atop it (which has an oxygen concentration of 0.15 mol/m3). The diffusivity of oxygen in the skin is 3.2 E-9 m?/s, and according to experiments that you've performed, you want to make sure that the concentration of oxygen in the device doesn't fall below 0.06 mol/m3. (Below that concentration harms the cells.) The rate of oxygen consumption is -5 E-17 mol/[cell•s]. What is the maximum cellularity (in cells/mL, three significant digits) that this tissue engineered skin can support?The material to be heated is in a long, cylindrical tube, and is viscous enough that any flow inside the tube can be ignored, i.e. the heating is by conduction alone). Also, consider the glass of the tube to be very thin so its thermal resistance can be ignored. The tube diameter is 1 cm and the properties of the material are the same those of water, given by 0.64 W/m*K, 1000 kg/m3, and 4180 J/kg*K, for thermal conductivity, density, and specific heat, respectively. The water bath temperature is 65 °C, and the initial temperature of the material is 27 °C. Without the agitation of the water bath, the heat transfer coefficient can be considered to be 128 W/m2*K. Considering the tube to be a long cylinder, how long does it take for the coldest point to heat up to a temperature corresponding to 99% of the total possible temperature increase? If the surrounding how water is agitated using a stirrer, leading to a considerably large surface heat transfer coefficient, how long does it…18:99