The concentration of CH3NC was measured at a constant time interval of every 10 seconds over a 5.00 minute period for the isomerization of acetonitrile. CH3CN(g) --> CH3CN(g) The plot of ln[CH3NC] versus time in seconds produced the linear regression equation: y= -6.3x10-3(x) - 1.366 How much time does it take to reach 50% of the initial concentraion for this reaction? a.) 217 s b.) 150 s c.) 20.2 s d.) 110 s

Determine the percentage error and the concentration of the prepared NAOH given the following data: 1. N NaOH (true) = 0.045 N Weight of KHP sample 0.2503 g V final NaOH V initial NAOH 52.1 mL 26.0 mL 25 mL N NaOH Average NaOH

2. Set the two equations equal and isolate In Ksp on one side of the equals sign by dividing both sides by (-RT). AG=RT'In Ksp=AH-TAS/-RT AG=In KSR=AH-TAS/-RT| 3. Create a graph using Excel plotting In Ksp on the y-axis and 1/T (make sure the units for temperature are Kelvin) on the x-axis. I In KSP 0 0.0029 -0.5 -1 -1.5 -2 -2.5 -3 -3.5 -4 -4.5 -5 0.003 0.0031 0.0032 1/T 0.0033 0.0034 0.0035 y=-2738x+5.075 R² = 0.9845 0.0036 a. Use the value obtained for the slope of the graph to solve for AH° using the equation derived in Question 2.

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Write the expression for Keq for the following reactions. In each case indicate whether the reaction is homogeneous or heterogeneous.(a) N2(g) + 3 H2(g)  2 NH3(g) Keq = PNH32 / (PN2 PH23) Keq = (PN2) (3 PH2) / 2 PNH3    Keq = PN2 PH23 / PNH32 Keq = 2 PNH3 / ((PN2) (3 PH2)) homogeneous or heterogeneous.     (b) 4 HCl(g) + O2(g)  2 H2O(l) + 2 Cl2(g) Keq = PHCl4 PO2 / PCl22 Keq = 2 PCl2 / (4 PHCl PO2)     Keq = 4 PHCl PO2 / 2 PCl2 Keq = PCl22 / (PHCl4 PO2)

6. The concentration of caffeine in an energy soft drink was determined by standard addition using HPLC. The following procedure was used: a standard caffeine solution was prepared by adding 0.09850g of caffeine to 25.0 cm3 of water.A series of solutions were prepared by adding known volumes of the standard solution to the soft drink before diluting to 100 cm3. The volume of standard and the caffeine peak area are shown in the table: Energy Drink (cm3) Added caffeine Std (cm3) Peak area       15 0 965   15 5 1352   15 10 1739   15 15 2126   15 20 2513       Determine the concentration of caffeine in the soft drink as mg cm-3.   A. 3.3 B. 2.3 C. 4.3 D. 7.3

02A: 2.1-2.5 and Accuracy Handout (70 min) ulate Figures of Merit for Trueness ▾ Part A. Absolute Error A breathalyzer is a portable electrochemical instrument that measures the concentration of ethyl alcohol in a sample of exhaled breath A forensic chemist checks the calibration of a breathalyzer by testing a standard air sample known to contain 0.174 mg/L of ethanol seven times. The average value of these seven replicate measurements is found to be 0 157 mg/1 Calculate the absolute error of the breathalyzer. 1971 ΑΣΦΑ Submit Previous Answers Request Answer ? Previous x Incorrect; Try Again: 4 attempts remaining Q Search mgl ly Colle 16 of 17 E dx Next 11:44 PM 1/31/202 BANG &

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A certain drug has a half-Iife in the body of 2.5 h. What should the interval between doses be, if the concentration of drug in the body should not fall belc 40.% of its initial concentration? Round your answer to 2 significant digits.

Consider the calcination of CaCO3: CaCO3 -> CaQ + CO, Before calcination, the initial weight of CaCO3 is 2.5g. After calcination, the final weight of CaCO3 was measured at 2.0 g. Calculate the conversion of CaCO; particles (x) using the following equation: m CaCO, -m CaCo, ) x = m Caco, -MCao |