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Why can we detect smaller samples with lower concentrations with a furnace than with a flame or a plasma?
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- Show that (ƏT· V др Cp (%) -1 HA temperature rise of 3.10 ± 0.20 °C was measured when a reaction was carried out in a calorimeter with a heat capacity of 0.841 ± 0.014 kJ °C -1 .The enthalpy change (Δ H ) was worked out as -2.61 kJ by using the equation:Enthalpy change (Δ H ) = heat capacity ( c ) × temperature change ( T )What is the root-squared error (in kJ) for Δ H ?Quote your answer to two decimal places.When you submit your answer, do NOT include units.(The minus sign in front of the enthalpy change indicates that the reaction is exothermic; don't include it in your calculation.)“Diffusion” sounds slow—and over everyday dis-tances it is—but on the scale of a cell it is very fast. The aver-age instantaneous velocity of a particle in solution—that is,the velocity between the very frequent collisions—isv = (kT/m)½where k = 1.38 × 10–16 g cm2/K sec2, T = temperature in K(37°C is 310 K), and m = mass in g/molecule.Calculate the instantaneous velocity of a watermolecule (molecular mass = 18 daltons), a glucose mol-ecule (molecular mass = 180 daltons), and a myoglobinmolecule (molecular mass = 15,000 daltons) at 37°C. Justfor fun, convert these numbers into kilometers/hour. Before you do any calculations, try to guess whether themolecules are moving at a slow crawl (<1 km/hr), an easywalk (5 km/hr), or a record-setting sprint (40 km/hr).
- Q4 A first order reaction A-B is being carried out in a CSTR. The feed stream containing reactant "A" at concentration C; is being fed at a constant rate F to reactor (Fig. Q2b). The volume (V) and temperature of the reactor are constant. Derive a transfer function relating concentration of "A" in the product stream (Co) to the feed stream concentration (C). The rate of reaction, r = k Co, Where k rate contant. Viume VA Langmuir probe of area 3.2 x 10-5 m2 measures an ion saturation current of 0.042 mA in an argon plasma with an electron temperature of 3.5 eV. Calculate the plasma density at the sheath edge. Take the argon atomic mass as 40 u. Give your answer in SI unitsyour team is developing insulation for the interior of a spaceship for a trip to Mars. Should you focus on materials with high or low values of Cp? Why?
- Find the average binding energy per molecule of waterH20, using the latent heat expression,What is the advantage of using small sample mass during thermal experiment?Problem II There is a piece of 10 mm thick a-iron plate. This plate initially has hydrogen uniformly distributed inside with an initial concentration Co. Assume that there is no hydrogen in the air. The plate is left in the air and the hydrogen concentration varies with the time as follows: 4Co C(x, t) = (-9n²Dt\ 12 3nx sin еxp where / is the thickness of the plate. If we would like to remove 95% of the hydrogen from the plate, how long will it take when the plate is at 25 °C? The pre-exponential and activation energy for hydrogen in a-iron are 0.1 mm/s and 13,400 J/mol, respectively.
- The hole density n silicon is given by p() 10 e WPx>0)where L-2x 10 cm Assume the hole diffusion coefficient is D.8 cm/s. Determine he hole dif. fusion current density at (a) X 0, (b) x2× 10 cm, and (c) x 10om.5. A drop of ink is gently deposited in a large volume of motionless water and initially has a radius of 1 mm. After 2 s the ink drop has diffused into a spherical ball with radius 3 mm. How long will it take the ball to diffuse from a radius of 1 mm to a radius of 11 mm (in s)? [All distances are root-mean-square averages.] (A) 8 (B) 15 (C) 20 (D) 35 (E) 50An experiment was conducted using planar electrodes in a given gas. 10 kV was applied to the planar electrode system with 0,2 cm distance between them and the current value passing through the system was measured as 5 nA. Then, the electric field was kept constant, the electrode opening was made as 0,5 cm and the current value passing through the system was measured as 50 nA. Calculate Townsend's first ionization coefficient accordingly.