Assume that the NO2 concentration in a house with a gas stove is .150 pg/m3. Calculate the equivalent concentration in ppm at STP,
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Assume that the NO2 concentration in a house with a gas stove is .150 pg/m3. Calculate the equivalent concentration in ppm at STP,
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- What temperature is required to obtain 0.4%C at a distance of 0.3 mm beneath the surface of a 0.22% C steel in 2h, when 1.1% C is present at the surface? Assume that the iron is FCC. (Please see figure 5.12 below for diffusion coefficient data. Please use your notes for a table of erf() function values Diffusion coefficient D (cm²/s) ܐ ܐ ܐ ܐ 10- 10-5 10- 10-10 10-11 10-12 10-13 10-14 10-15 Temperature (°C) 2000 1500 1200 1000 900 800 700 600 Cin graphite Mg in MgO Ca in Cao H in FCC iron C in FCC iron Fe in FCC iron Fe in BCC iron H in BCC iron C in BCC iron Fe in FeO 500 5 6 7 8 9 10 11 12 13 104 T(K) Figure 5-12 The diffusion coefficient D as a function of reciprocal temperature for some metals and ceramics. In this Arrhenius plot, D represents the rate of the diffusion process. A steep slope denotes a high activation energy.An aluminum calorimeter with a mass of 100 g contains 250 g of water. The calorimeter and water are in thermal equilibrium at 10.0°C. Two metallic blocks are placed into the water. One is a 50.0-g piece of copper at 80.0°C. The other has a mass of 70.0 g and is originally at a temperature of 100°C. The entire system stabilizes at a final temperature of 20.0°C. (a) Determine the specific heat of the unknown sample?A 9.00-mol sample of H₂ gas is contained in the left side of the container shown below, which has equal volumes on the left and right. The right side is evacuated. When the valve is opened, the gas streams into the right side. H₂ Valve Vacuum (a) What is the entropy change of the gas? J/K (b) Does the temperature of the gas change? Assume the container is so large that the hydrogen behaves as an ideal gas. The temperature decreases. O The temperature increases. The temperature does not change. ✓
- (9A metal rod made of some alloy is to be used as a thermometer. At OoC its length is 40000cm, and at 1000C its length is 40060cm. (a) What is the linear expansion coefficient of the alloy? (b) what is the temperature when its length is 39975cm?(iii) If HOCI (hypochlorous acid) degrades in water per first-order kinetics with a rate constant of 0.12/d. the initial concentration of HOCI is 12 mg/L (a) How long does it take to be reduced to 0.8 mg/l ? (b) what would be concentration after 4 hours? (6)Small droplets of carbon tetrachloride at 68 °F are formed with a spray nozzle. If the average diameter of the droplets is 300 μm what is the difference in pressure between the inside and outside of the droplets? Pa
- Which of the following is not a cause of energy loss in pipes? O Boundary friction O Changes in pipe diameter or geometry O The presence of control valves or fittings O Pipe temperature(i) For a waste water, the BOD, at 20°C is found to be 200 mg/l. What will be BOD, at 30°C for the same? The reaction constant 'K' (to the base e) at 20°C is 0.2 per day.Calculate the amount of barium from Sodium sulphate in a liter. A 100 ml solution of sodium sulphate (Na2SO4) is treated with solution of Barium chloride(BaC12). The precipitate, then ignited and weighed. the precipitate(BaSO4) weight is 0.1 gm. Mol.Wt of BaSO4 233.42 gm/mol, At. Wt of barium= 56 gm/mol. %3D
- The efficiency for a steel specimen immersed in a phosphating tank is the weight of the phosphate coating divided by the metal loss (both in mg/ft2). An article gave the accompanying data on tank temperature (x) and efficiency ratio (y). Temp. 171 Ratio 0.78 1.29 1.34 y = 173 174 Ratio Temp. 181 Ratio 1.47 1.62 1.63 2.09 181 181 Temp. 183 183 183 175 1.83 1.98 2.78 1.13 181 185 175 1.17 181 2.21 185 176 1.14 182 0.86 186 177 1.02 182 1.45 187 178 1.82 183 0.82 189 1.59 2.42 3.10 1.97 3.00 (a) Determine the equation of the estimated regression line. (Round all numerical values to four decimal places.) (b) Calculate a point estimate for true average efficiency ratio when tank temperature is 183. (Round your answer to four decimal places.) (c) Calculate the values of the residuals from the least squares line for the four observations for which temperature is 183. (Round your answers to two decimal places.) (183, 0.82) (183, 1.83) (183, 1.98) (183, 2.78) Why do they not all have the same…When the system is at equilibrium at a particular temperature, C(s) + CO2(g) =2 CO(g) a 4-L flask contains 0.40 mol CO, 0.80 mol CO2, and 0.45 mol C. What is the value of K, at that temperature? O 0.050 O 0.20 1.8 O 0.44Please choose the correct answer for each question: 1. Activity of a gas in equilibrium with solution is ______? A. its partial pressure; B.1.0; C. its molar concentration; D. 0.0 2. During a sorption procedure, the substance transferred from the gas or liquid phase to the solid phase is called ______ A. sorbent; B. sorbate; C. partition; D. none of the above 3. When a chemical has a lower KOW, it is more ______ A. hydrophobic; B. hydrophilic; C. more absorbable; D. less absorbable 4. _____ occurs on the adsorbent surface A. Adsorption; B. Sorption; C. Absorption; D. Adsorption and absorption 5. _____ addresses the change in the amount of a substance of interest with time. A. The equilibrium approach; B. The kinetic approach; C. Henry’s Law; D. Freudlich isotherm equation
