Study Guide for Chemistry: The Central Science
14th Edition
ISBN: 9780134554075
Author: Theodore E. Brown, H. Eugene LeMay, Bruce E. Bursten, Catherine Murphy, Patrick Woodward, Matthew E. Stoltzfus, James C. Hill
Publisher: PEARSON
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Chapter 14, Problem 20E
A flask is charged with 0.100 mol of A and allowed to react to form B according to the hypothetical gas-phase reaction A (g) →B (g). The following data are collected:
| Time (s) | 0 | 40 | 80 | 120 | 160 |
| Moles of A | 0.100 | 0.067 | 0.045 | 0.030 | 0.020 |
(a) Calculate the number of moles of B at each time in the table, assuming that A is cleanly converted to B with no intermediates. (b) Calculate the average rate of disappearance of A for each 40 s interval in units of mol/s. (c) Which of the following would be needed to calculate the rate in units of concentration per time: (i) the pressure of the gas at each time, (ii) the volume of the reaction flask, (iii) the temperature, or (iv) the molecular weight of A?
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