The concentration and absorbance data below were collected for compound X. A sample of compound X of unknown concentration has a corrected average absorbance of 0.5621 (3 replicate measurements). Calculate the y-intercept. CONCENTRATION (mg/mL) ABSORBANCE 5 0.422 10 0.510 15 0.621 a. 0.299 b. 0.222 c. 0.319 d. 0.553

em1.png Part 3: Q9 Average absorbance Flask 8 Flask 9 Flask 10 1:1 Ratio so, Flask 11 Part 3: Q Flask 8 Flask 9 Flask 10 Flask 11 Part 3: Q10 Flask 8 Flask 9 Flask 10 Flask 11 Part 3 0.146 0.166 [Fe] -0.002mol/L 0.215 0.294 [FESCN³mol/L) 4.59% 10 5.18*10* 6.64*10* 9.08*10* [FXmol/L) 5.00 *10* 5.00*10* Y=3362x-0.0083 R² = 0.9993 5.00*10* 5.00*10* (Amounts of flask 8 (9 - 11's values are in the spreadsheet) 71% volume 5.00mL Molarity of Fe(NO3))3 = 0.2M Volume of Fe(NO3))3 = 5.00mL Moles of Fe³= Molarity x volume(L) Moles of Fe¹ = 0.2M X 0.005L = 1x10-³mole x [SCN][mol/ 4x10 5×10-4 7x10 1×10 1 Concentration of Fe³ = mole of Fe³ Volume mole of Fe³1x10³ mole G.O05L 8, Average absorbance for solution 8 (same for 9 - 11) Average absorbance for flask 8 = sum of all absorbances / number of readings (0.145 +0.147 +0.148) 3 Using equation of calibration curve's line(slope) of best fit, the average absorbances of the unknown concentrations to determine [FeSCN-Jat equilibrium in solution 8:…

A standard containing 20 mg/mL of compound P is placed in a 1 cm cuvette. The absorbance of the standard is 1.20 at 600 nm.  A sample containing Compound P has an absorbance of 0.50.  What is the concentration of this sample?

Sample #1 has an absorbance of 0.300. Sample #2 is the same substance and has an absorbance of 0.600 using the same equipment. What is the relative concentration of the second sample? Select one: a. The concentration of sample #2 is the square root of that of #1. b. The concentration of sample #2 is that of sample #1 squared. c. The concentration of sample #2 is half that of sample #1. d. The concentration of sample #2 is twice that of sample #1.

Rsimi, Nour 2023VVA Chemistry.7b.FA1 An unknown solid substance is heated according to the temperature versus time graph below. Temperature (°C) 70 40 30 20 288 8 2 0 0 5 15 Time (min) 20 00 4 of 5 1 2 3 4 5 25 While the substance is a liquid, at what temperature do the molecules of the substance have the greatest average kinetic energy? 2 % 3 4 5 16 7 8 insert

A colored ion solution has a concentration of 0.200 M with a measured absorbance A = 0.880. Another ion solution made of the same chemicals has an absorbance A = 0.172. What is the concentration of this unknown sample solution?

The data in the table are used to create a calibration curve for the determination of RNA from its absorbance at 260 nm. Use a spreadsheet and the least-squares method to determine the slope and y-intercept of the best straight line fit to the calibration curve. Do not subtract the blank reading when creating the calibration curve. m = b = RNA (µg) 0.00 10.67 21.34 32.01 42.68 mass= Absorbance at 260 nm 0.224 0.512 0.769 1.145 1.465 Using the slope and intercept of the calibration curve, determine the quantity of RNA in a sample that gives an absorbance of 0.636. µg µg

In an experiment on UV-Vis Spectrophotometry, What are the results for A and B? A. Calibration Curve Concentration of Cu2+ solution                      Absorbance Molarity (M) ppm Cu     0.010     .0965 0.020     0.199 0.030     0.3235 0.040     0.4385 0.050     0.5543 0.060     0.6652 0.070     0.7239 0.080     0.8463 0.090     1.0354 0.100     1.3572 B. Unknown Analysis Trial Absorbance ppm Cu 1 0.4681   2 0.5074   3 0.4297   Average ppm Cu in sample Standard Deviation % Relative Standard Deviation

Can you help me on questions 2 AND 3

Hh.130.