Q 18 and Q19 And Q20 please 15. Capillary columns are open tubular columns constructed from which ofthe following materials?a) Glassb) Metalc) Stainless steeld) Fused silica16. The Calcium Ca2 (40.08 g/mol) in a 200 ml sample was precipitatedand ignited to give CaO (56.08 g/mol) a weight of 0.1132 g Calculatethe mass of Ca/100 ml?a) 40.38b) 0,040c) 46.04d) 33.3217. The difference between the experimental value and the true value iscalled:a) relative error b) precision c) accuracy d) absolute error18.A 500 ml of water sample is found to contain 0.0014 g of CaCO (M Wt100 g/mol). Calculate the concentration of CaCO, in parts per million(ppm).a) 2.80b) 1.4 x 10²c) 5.60d) 1.4019. Given a 7.50 x 10 M solution of KMnO, that has a transmittance of36.4% when measured in a 1.0 cm cell at a wavelength of 525 nm.Calculate the absorbance of this solutiona) 191.1b) 0.439c) 273x10d) 32 x 1020. Calculate the molar absorbtivity of the above KMnO, solution:a) 584 cm'mol Lb) 585 x 10 cmmor Lc) 25.48 x 10 cm'mol Ld) 1.87 x 10 cm mot21. In Gas-liquid phase chromatography, the stationary phase is composedand the mobile phase is made ofofa Solid liquidb)Liquid liquidc)Liquid gasd) Solid, gas

Answered: Image /qna-images/answer/26968948-62da-4268-8550-dd7a45b8f46b.jpg

18.A 500 ml of water sample is found to contain 0.0014 g of CaCOs (MW 100 g/mol). Calculate the concentration of CaCO, in parts per million (ppm) a) 2.80 b) 1.4 x 10² c) 5.60 d) 1.40 19. Given a 7.50 x 10 M solution of KMnO, that has a transmittance of 36.4% when measured in a 1.0 cm cell at a wavelength of 525 nm Calculate the absorbance of this solution b) 0.439 a) 191.1 c)273x10 d) 32x 10 20. Calculate the molar absorbtivity of the above KMnO, solution b) 5.85 x 10 cm mor d) 1.87 x 10 cm mot a) 564 cm'mol L c) 25.48 x 10 cm'mol L

18.A 500 ml of water sample is found to contain 0.0014 g of CaCOs (MW 100 g/mol). Calculate the concentration of CaCO, in parts per million (ppm) a) 2.80 b) 1.4 x 10² c) 5.60 d) 1.40 19. Given a 7.50 x 10 M solution of KMnO, that has a transmittance of 36.4% when measured in a 1.0 cm cell at a wavelength of 525 nm Calculate the absorbance of this solution b) 0.439 a) 191.1 c)273x10 d) 32x 10 20. Calculate the molar absorbtivity of the above KMnO, solution b) 5.85 x 10 cm mor d) 1.87 x 10 cm mot a) 564 cm'mol L c) 25.48 x 10 cm'mol L

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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