Gasoline samples containing pollutant S was analysed using GC-FID. The data of analysis was shown in Table 2. Injection 1 2 Table 2 21.1 ppm toluene (Internal standard) 33.4 ppm S 21.1 ppm toluene (Internal standard) X ppm S tr (min) 10.11 14.82 10.05 14.77 peak area 36,242 45,997 38,774 39,115 Calculate the amount of S presence in the sample by using y my th equation
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- 4. A new method for the determination of mercury in fish was tested against a N.I.S.T. standard to determine if there was any bias (determinate error) in the new technique. The N.I.S.T. standard fish sample was certified to contain 13.55 ppm Hg. The results of six analyses by the new method gave a mean value of 14.15 ppm and s.d. = 0.42 ppm. Does the new method give accurate results at the 95% confidence level?Chemistry The levels of an organic pollutant (P) in the groundwater at the perimeter of a plant were a cause for concern. A 10 mL sample of the water was taken and the pollutant was extracted with 95% efficiency using 25 mL of diethyl ether. GC was used to analyse the concentration of P in diethyl ether. A calibration curve was plotted for a series of standards of P which yielded the following results: Peak Area Toluene Conc. (µg/ml) 12,000 2.6 23,700 5.0 35,500 7.7 46,800 9.9 31,250 Sample Determine the concentration of P in ppb in the initial groundwater sample.The researcher extracts a sample of well water and prepares it for TXRF analysis with a 10.00 mg/L V internal standard, like the calibration standards. The result produces SCa = 69297.81 and SV = 13481.2.Determine the concentration of Ca.
- 1) 1500 kg mixture contains 15% acetone, 75% water and 10% Acetic acid by weight. a) Calculate the total mole of mixture and molar fractions of each compound. b) Calculate Average Molecular Weight of mixture. c) 2 kmol more Acetic acid is added to the mixture. What would be the mass fractions of this new mixture? (MW: Acetone= 58 g/mol Water= 18 g/mol Acetic acid= 60 g/mol)O 15 Ppm 2. In a certain polluted area, the partial pressure of NO gas was 8 pascal. The mixing ratio of NO is . ppmv (assume normal conditions) 3. A 500 kg sample of a fertilizer containing 115 ppms Cu was mixed with 15,000 kg soil which also contains 2.0 ppms Cu. The final level of Cu is ........ pPpms 4. The mixing ratio of H,S gas is 0.2 ppmv and the total flux into atmosphere is 2.5x10" kg Estimate r for H;S. ....kg (assume normal conditions and volume of atmosphere 4.0x10" m)S & Post-Ax d Al2_Sin x > School x 8 Post-A: x ☐ bcps.schoology.com/common-assessment-delivery/start/6425623769?action=onresume&submissionid=969196920 NGLSync Portal Ho..... S week of 12/20 Post-Assessment Unit 1 LC2 S Grades X 6 School X S Pre-As X Identify the type of the reaction for each chemical equation. a. 2 Ag₂O → 4 Ag + O₂ b. CaO + H₂O → Ca(OH)₂ c. Pb(NO3)2 +KI → Pbl2 + 2 KNO31 Meet - nfw-jxsi-wtd 1 # Synthesis (A + B Ⓡ AB) d Al2_Sin x G The foll x G rocket x P Quizizz CPM CPM eBooks Index... Mycoplasma pneu... a Quizizz СРМ :: Single Replacement (AB+C ⓇAC + B) S Double Replacement (AB + CD ⓇAD + CB) :: Decomposition (ABⓇA + B) P 1 2
- Chemistry The amount of V was found to be 0.19% (+/-) 0.02% V (N=6). Calculate t-calc, assuming 95% confidence level.An aquifer contaminated with petroleum is found to have the following component concentrations at a particular site: benzene 158 ppm toluene 124 ppm ethylbenzene 91 ppm xylene 45 ppm n-heptadecane 161 ppm pristane 84 ppm Provide an estimate for the age of the spill at this site using (a) BTEX ratio and (b) nC17:Pr ratio. Show your calculations and use units throughout. Give proper s.f. for the answer.(a) (i) Ksp value of Cul is 5.0 x10-12 mol2dm at 25 °C. Calculate the maximum number of moles of Cul that can be dissolved in 1 dm³ of water at 25 °C. (ii) Calculate the maximum number of moles of Cul that can be dissolved in 1 dm³ of 0.1 moldm³ of Nal solution at 25 °C.
- An analysis of city drinking water for total hardness was done by two students in the laboratory and produced the following results (in ppm CaCO3): Student A: 228.3, 226.4, 226.9, 227.1, and 228.6. Student B: 229.5, 226.1, 230.7, 223.8, and 227.5What is the 95% confidence interval for the mean?Leaching of Oil from Soybeans in a Single Stage. Repeat Example 12.9-1 for single-stage leaching of oil from soybeans. The 100 kg of soybeans contains 22 wt % oil and the solvent feed is 80 kg of solvent containing 3 wt % soybean oi!. = 0.239, V, = 50.0 kg, x41 = 0.239, N, = 1.5 Ans. L, = 52.0 kg, ya1 wwwwwPV = nRT. The pressure is 0.9912atm. V = 50.5 mL. T = 21.5°C and n = 0.00200mol. Calculate R from this data in Latm/molK.