Question

As stated in the chapter, potassium superoxide ( $\mathrm{KO}_2$ ) is a useful source of oxygen employed in breathing equipment. Calculate the pressure at which oxygen gas stored at $20^{\circ} \mathrm{C}$ would have the same density as the oxygen gas provided by $\mathrm{KO}_2$. The density of $\mathrm{KO}_2$ at $20^{\circ} \mathrm{C}$ is $2.15 \mathrm{~g} / \mathrm{cm}^3$. 

   As stated in the chapter, potassium superoxide ( $\mathrm{KO}_2$ ) is a useful source of oxygen employed in breathing equipment. Calculate the pressure at which oxygen gas stored at $20^{\circ} \mathrm{C}$ would have the same density as the oxygen gas provided by $\mathrm{KO}_2$. The density of $\mathrm{KO}_2$ at $20^{\circ} \mathrm{C}$ is $2.15 \mathrm{~g} / \mathrm{cm}^3$.
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Chemistry
Chemistry
Raymond Chang, Jason… 14th Edition
Chapter 21, Problem 76 ↓
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As stated in the chapter, potassium superoxide ( $\mathrm{KO}_2$ ) is a useful source of oxygen employed in breathing equipment. Calculate the pressure at which oxygen gas stored at $20^{\circ} \mathrm{C}$ would have the same density as the oxygen gas provided by $\mathrm{KO}_2$. The density of $\mathrm{KO}_2$ at $20^{\circ} \mathrm{C}$ is $2.15 \mathrm{~g} / \mathrm{cm}^3$.
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As stated in the chapter, potassium superoxide $\left(\mathrm{KO}_{2}\right)$ is a useful source of oxygen employed in breathing equipment. Calculate the pressure at which oxygen gas stored at $20^{\circ} \mathrm{C}$ would have the same density as the oxygen gas provided by $\mathrm{KO}_{2}$ The density of $\mathrm{KO}_{2}$ at $20^{\circ} \mathrm{C}$ is $2.15 \mathrm{g} / \mathrm{cm}^{3}$

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7. Potassium superoxide (KO2) is a useful source of oxygen employed in breathing equipment. Exhaled air contains moisture, which reacts with KO2 to produce oxygen gas. (The other products are potassium hydroxide and hydrogen peroxide.) a) Write an equation for the reaction. b) Calculate the pressure at which oxygen gas stored at 20°C would have the same density as the oxygen gas provided by KO2 . The density of KO2 at 20°C is 2.15 g/cm3

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Potassium superoxide, $\mathrm{KO}_{2}$, is used in some rebreathing gas masks (in which the exhaled breath is recycled in a closed space). Water vapor in the exhaled air reacts with potassium superoxide to produce oxygen gas: $$ 4 \mathrm{KO}_{2}(s)+2 \mathrm{H}_{2} \mathrm{O}(l) \longrightarrow 4 \mathrm{KOH}(s)+3 \mathrm{O}_{2}(g) $$ In an experiment at $25^{\circ} \mathrm{C}$ and $1.00 \mathrm{~atm}$ in which water vapor reacts with a quantity of potassium superoxide, it was found that $2.70 \mathrm{~kJ}$ of heat was absorbed. The oxygen gas produced was then collected at $23.0^{\circ} \mathrm{C}$ and $789 \mathrm{mmHg}$. What volume (in liters) of oxygen was collected?

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Transcript

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00:01 This is question 81 from tactford 23 and we are trying to find the pressure of potassium super oxide.
00:08 So they give us a density of 2 .15 grams per centimeters cubed.
00:16 So the first thing i do is actually convert this to liters because we're going to be talking about using the ideal gas law.
00:22 So a thousand centimeters cubed is equal to one liter.
00:38 And this is equal to one liter.
00:38 And this is equal.
00:43 To 2 ,150.
00:49 And next we're gonna divide that by the volume.
00:53 And the volume we're gonna assume is that stp, so standard temperature pressure.
00:57 So 2 .150 over, let's you're gonna multiply that with the volume...
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