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Scan_Doc0112 - Solution Where are we going • To determine...

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204 Chapter Five Gases Figure 5.13 The production of oxygen by thermal decomposition of KCI0 3 . The Mn02 is mixed with the KCI0 3 to make the reaction faster. Oxygen plus water vapor' -, EXAMPLE 5.18 A sample of solid potassium chlorate (KCI0 3 ) was heated in a test tube (see Fig. 5.13) and decomposed by the following reaction: 2KCI0 3 (s) ----+ 2KCl(s) + 30 2 (g) The oxygen produced was collected by displacement of water at 22°C at a total pressure of 754 torr. The volume of the gas collected was 0.650 L, and the vapor pressure of wa- ter at 22°C is 21 torr. Calculate the partial pressure of O 2 in the gas collected and the mass of KCl0 3 in the sample that was decomposed. Solution
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Unformatted text preview: Solution Where are we going? • To determine the partial pressure of O 2 in the gas collected • Calculate the mass of KCl0 3 in the original sample What do we know? Gas Collected Water Vapor P 754 torr 21 torr V 0.650 L T 22°C + 273 = 295 K 22°C + 273 = 295 K How do we get there? What is the partial pressure of 02? PTOTAL = Po, + PH,o = Po, + 21 torr = 754 torr • Po, = 754 torr -21 torr = 733 torr What is the number of moles of 02? Now we use the ideal gas law to find the number of moles of 02: Po,V n---0, -RT...
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