1. σ=[(Σd2)/(n-1)]½ n= number of trials d= measured value - mean σ=[(8.50mL-8.74mL)2+(9.72mL-8.74mL)2+(8.00mL-8.74mL)2/(3-1)]½ 2. σ=[(Σd2)/(n-1)]½ n= number of trials d= measured value - mean σ=[(10.69-11.52)2+(11.80-11.52)2+(12.07-11.52)2/(3-1)]½
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1. σ=[(Σd2)/(n-1)]½
n= number of trials
d= measured value - mean
σ=[(8.50mL-8.74mL)2+(9.72mL-8.74mL)2+(8.00mL-8.74mL)2/(3-1)]½
2.
σ=[(Σd2)/(n-1)]½
n= number of trials
d= measured value - mean
σ=[(10.69-11.52)2+(11.80-11.52)2+(12.07-11.52)2/(3-1)]½
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- Propagate the error in the following expression:(0.5847(±0.0002)mole / 250.0(0.1)??) ×(1000 ml / 1 L)0+ 4000 A B RAVENEER NN 8.19 6.74 6.00 5.00 4.00 9.87 7.66 3.00 2.00 Peak A (3171 cm-1) = Peak B (1669 cm-1) = 1.00 0.00 1. Empirical Formula = C7H602 10.0 8.0 6.0 4.0 2.0 0.0 5/ppm2. As the director of a research laboratory you are paid to decide if there is a significant difference between the mean values of two sets of data obtained by two different scientists, a senior scientist and one recently hired. Use 95% CL. (t at df = 10 is 2.23) Data of Senior Scientist: Xmean = 24.66% with s = 0.06% for n = 5 Data of the New Kid: xmean = 24.55% with s = 0.10% for n = 7
- (81310 - 76200) ÷ 0.00216 With Sig FigsQ6. The following set of millimolarities were obtained when standardizing a solution: 10.67, 10.71, 10.66, and 10.45. One value appears suspect. Using Q test determine if it can be ascribed to accidental error, at the 90% confidence level.7) The homogeneity of the chloride level in a water sample from a lake was tested by an analyst. Below are the concentration in parts per million (ppm) of Cl: 27.32, 27.22, 27.21, 27.24, 27.20 i. Determine the mean and median. ii. Calculate the confidence limit at 90%. iii. Identify a possible outlier and use the Q-test to determine whether it can be retained or rejected at 90% confidence level
- (Concentration) You are tasked to prepare 50.000 ppm of a caffeine standard for an analysis. If you need to prepare 500.00 (±0.08) mL of this solution, how much (in grams) solid, pure caffeine are you supposed to dissolve? What absolute uncertainty is associated with your mass measurement if the prepared solution has a 0.12% percent relative uncertainty? Write your answer using the appropriate number of digits. Note that the formula mass of caffeine is 194.194 g/mol with negligible error. (absolute error) How many significant figures does your reported mass have? --- (number of sig. figs.)Use the figure below (Figure F01-7-8) to answer this question. Temperature Anomaly (°C) 106 [OSS [ [(4 10% COD -€62 · [(14) -€0.06 Annual mean 15 year mean 1:00:3 130233 1840) Which statement is a correct interpretation of the data depicted in the plot? The mean global temperature has decreased by ~0.9 °C since 1880. O The mean global temperature has increased by ~0.9 °C since 1880. O The mean global temperature has increased by ~1.1 °C since 1880. The mean global temperature has decreased by ~1.1 °C since 1880. The mean global temperature has increased and decreased since 1880 but overall, the temperature has remained constant.Y Submit Part C [OH-] = 5.4 x 10-4 M Express your answer using two decimal places. pH = Request Answer Part D [VD| ΑΣΦ VO Submit Request Answer [OH-] = 0.004 M Express your answer using one decimal place. pH = ΠΕ ΑΣΦ ha ? Address
- Hello, Can you please answer these 3 questions? Thank you!Density of solution:Trial 1: 1.2 g/mLTrial 2: 1.2 g/mLTrial 3: 1.2 g/mL Average density = 1.2 g/mL What is the relative average deviaion, %?In the technique of high performance liquid chromatography (HPLC) the peak area response for a particular analyte is directly proportional to concentration Analgesic tablets typically consist of aspirin and caffeine as the active ingredients, the remainder made up of inert binding material. The concentrations of aspirin and caffeine may be routinely monitored using HPLC, whereby the peak areas obtained from a solution of the tablet are compared with those obtained from standard solutions of the analytes. In an analysis to determine the concentration of caffeine in such a tablet, the following data were recorded: Solutions Analysed: Tablet Sample: Mass of tablet (dissolved in 250 cm methano): 0.523 g Caffeine Standard: Mass of caffeine (diessolved in 500 cm methanol) 0.105 g HPLC results: Solution Peak Area (catfeine) 1. Tablet Sample 325 2. Caffeine Std. 865 The concentration of caffeine in the tablet (expressed as a mass (w/wl percentage) was Oa 1.89 Ob 13.4 O 3.77 Od. 267 Oe 7.54 You…