(1) 請問總固定生產成本為多少？(5分)

(2) 請問該麵攤賣第4碗麵時的邊際成本為多少？(5分)

一、Analytical chemistry(問答與計算50分，可使用工程用計算機) 1. A 0.9827 g solid sample containing ascorbic acid (vitamin C) and inert ingredients was dissolved in 1 M HCl and then diluted to 100.0 mL. A 25.00 mL aliquot of the solution was added with 0.5 g KI and 1 mL 2% starch indicator, and titrated with 25.22 mL of 0.0158 M KIO3 solution to reach the end point. (A) The reactions are IO3- + I- →I2 (unbalanced) and C6H8O6 + I2 → C6H6O6 + 2I- + 2H+. Write the balance equation for IO3- + I- →I2. (4分)

(B) Calculate the weight percent of ascorbic acid (C6H8O6, 176.13 g/mol) in the sample. (5分)

2. A solution containing Cd2+ was analyzed voltammetrically using standard addition method. A 25.00 mL of deaerated Cd2+ containing sample solution, which was 1 M in HNO3, produced a peak current of 1.77 μA. Following addition of 1.00 mL of 1.2510-3 M Cd2+ solution, the resulting solution produced a current of 2.33 μA under the same measuring condition. Calculate the molar concentration of Cd2+ in the sample.(7分)

3. Mix 10.00 mL of 0.100 M HOCl with 10.00 mL 0.100 M NaOH, calculate the pH of the final solution. (For HOCl, Ka = 3.0010-8) (7分)

4. A line diagram of pH combination electrode (a cell) can be written as follows: Explain the principle for the measurement of pH (of external solution) by the cell.(8分)

5. (A) Explain reversed-phase liquid chromatography. (5分)

(B) If phenol and toluene were separated by applying reversed-phase liquid chromatography, which one would be eluted first, why? (4分) Explain why.

(C) Atomic spectra are line spectra while molecular spectra are band spectra. (5分)

(D) Photon detectors were used in UV-Vis spectrophotometer while thermal detectors were used in IR spectrometer.(5分)

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