Question 31 Consider the gaseous reaction at 450.0 K 2A(g) + B₂(g) → 2AB(g) Time (min) 0 100 200 Molarity A 0.800 0.600 (?) Molarity B₂ 1.000 (?) (?) Molarity AB 0.000 (?) 0.500 At time 200 minutes, the molar concentration of A is A 0.500 0.300 0.250 0.200 B C D 300 (?) 0.700 (?) 400 0.200 (?) (?)
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- A flask is charged with 0.110 mol of A and allowed to react to form B according to the following hypothetical gas-phase reaction. A(g) B(g) The following data are collected. times (s) 0 40 80 120 160 moles of A 0.110 0.066 0.042 0.027 0.016 (a) Calculate the number of moles of B at each time in the table.0 s mol40 s mol80 s mol120 s mol160 s mol(b) Calculate the average rate of disappearance of A for each 40 s interval, in units of mol/s.0 - 40 s mol/s40 - 80 s mol/s80 - 120 s mol/s120 - 160 mol/s mol/sFor the reaction 2N2O5(g) → 4NO2(g) + O2(g), the following data were collected. t (minutes) [N2O5] (mol/L) 0 1.24 × 10–2 10. 0.92 × 10–2 20. 0.68 × 10–2 30. 0.50 × 10–2 40. 0.37 × 10–2 50. 0.28 × 10–2 70. 0.15 × 10–2 The concentration N2O5 at 100 min will be approximately Question 17 options: A) 0.10 × 10–2 mol/L B) 0.01 × 10–2 mol/L C) 0.06 × 10–2 mol/L D) 0.03 × 10–2 mol/L E) none of theseA political candidate fighting for a smoke-free environment conducts an experiment in a room containing 1400 cubic feet of air that is initially free of carbon monoxide. Beginning at time t=0, cigarette smoke containing 4% carbon monoxide is introduced into the room at the rate of 0.1 cubic foot perminute, and the well-circulated mixture is allowed to leave the room at the same rate. If carbon monoxide levels in the air reach 0.012%, it is harmful to the human body. Find the time at which this unhealthy level is reached.
- 1. The decomposition of aqueous sucrose to form the isomers glucose and fructose is a common organic reaction, which requires a strong catalyst: C12H22O11(aq) + H2O(l) → 2C6H12O6(aq). The following data were collected during the process: Time (min) [C12H22O11] (mol/L) 0 0.316 39 0.274 80 0.238 140 0.190 210 0.146 (a)If we performed a new trial with an initial concentration of sucrose of 0.400 mol/L, what concentration would remain after 4.0 h has passed? 2. Methyl isomerizes to acetonitrile, CH3NC(g) → CH3CN(g) at 215°C. The following data were collected during the process: Time (sec) [CH3NC] (mol/L) 2000 0.0110 5000 0.0059 8000 0.0031 12000 0.0014 15000 0.0007 2. (a)Assuming the process continues, what concentration of methyl isonitrile would we expect after 5.00 h?For the gas phase decomposition of dinitrogen pentoxide at 335 K 2 N₂05 4 NO2 + O2 the following data have been obtained: [N₂05], M time, s 0.175 0 Submit Answer 9.06x10-2 140 4.69x10-2 280 2.43x10-2 420 The average rate of disappearance of N₂O5 over the time period from t = 280 s to t = 420 s isCalcium oxide, an important ingredient in cement, is produced by decomposing calcium carbonate at high temperature: CaCO3(s) → CaO(s) + CO2(g) In one reaction, 3.9 kg of calcium carbonate is heated at 589 °C in a 20.0-L vessel. The pressure of CO2 is 0.18 bar after 6.5 minutes. question 1. What is the average rate of CO2 production in mol/min during the 6.5-minute interval? question 2. How many moles of calcium carbonate consumed in the 6.5-minute interval?
- What percentage of the initial amount of S02Cl2 2ilk remain after 2.25 hours?For the following reaction 6 experiments have been run and the data collected is in the following table: 2 MnO4-(aq) + 5 H2C2O4 (aq) + 6 H+ (aq) ---> 2 Mn2+ (aq) + 10 CO2 (g) + 8 H2O (l) Experiment [MnO4-], M [H2C2O4], M [H+], M Rate, M/s 1 0.2410 0.3470 0.2690 0.1147 2 0.3260 0.6210 0.2270 0.2776 3 0.5630 0.5740 0.7420 0.4431 4 0.2410 0.3470 0.3840 0.1147 5 0.4140 0.5740 0.5610 0.3258 6 0.3260 0.4930 0.4910 0.2203 a) Find the order of the reaction with respect to H+. _______________ b) Find the order of the reaction with respect to MnO4-. ______________ c) Find the order of the reaction with respect to H2C2O4. _____________ d) What is the overall order of the reaction? ________________________Consider the following reaction and the experimental data in the table below.2 ??(?) + ?2(?) → 2 ??2(?)Experiment [NO] (M) [O2] (M) Initial Rate (M/s) 1 0.10 0.10 0.18 2 0.10 0.20 0.35 3 0.20 0.20 1.42Calculate the rate of the reaction when [NO] = 0.35 M and [O2] = 0.65 M
- The decomposition of H2O2 was studied and the concentration (in moles per liter) as a function of time was determined. a. Create a spreadsheet in Excel with the following columns and values. Calculate values for the natural logarithm of [H2O2] using an appropriate formula. Time H2O2(M) LN [H2O2] 0 0.862 120 0.556 240 0.394 360 0.246 480 0.149 b. Create a graph of [H2O2] versus time. Use the Scatter chart type and use the subtype that connect the points with a line. c. Create a graph of LN(H2O2) versus time. Use the scatter chart type and use the subtype that does not connect the points with a line. Instead, insert a trendline (linear fit) and display the equation of the line on the graph. d. Using the trendline equation, calculate the natural log of concentration (LN[H2O2] corresponding to a time elapsed of 200 seconds. From that value, calculate the molar concentration of H2O2 at 200 secondsIn a study of the gas phase decomposition of sulfuryl chloride at 600 KSO2Cl2(g)SO2(g) + Cl2(g)the concentration of SO2Cl2 was followed as a function of time.It was found that a graph of ln[SO2Cl2] versus time in minutes gave a straight line with a slope of -4.28×10-3 min-1 and a y-intercept of -6.95 . Based on this plot, the reaction is________. (firest, zero, or second) order in SO2Cl2 and the rate constant for the reaction is min-1.QUESTION 10 Measurements taken during the following reaction showed a concentration of carbon monoxide (CO) of 196.9 mol/L at 13.9 min and of 122.7 mol/L at 29.5 min. CO (g) + NO2 (g) --> CO2 (g) + NO (g) Calculate the average rate of the gain of carbon dioxide (CO2) in M/sec. Write the answer in scientific notation with 3 sig.dig.