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Standard XII

Chemistry

Stoichiometric Calculations

A self-contai...

Question

A self-contained breathing' apparatus uses potassium superoxide, $K O_{2}$ , to convert the carbon dioxide and water in exhaled air into oxygen, as shown by the equation: $4 K O_{2} (s) + 2 H_{2} O (g) 4 C O_{2} (g) \to 4 K H C O_{3} (s) + 3 O_{2} (g)$
How many molecules of oxygen gas will be produced hem 0.0468 g of carbon dioxide that is exhaled in a typical breath?

4.8 \times 10^{20}

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6.4 \times 10^{20}

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8.5 \times 10^{20}

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1.9 \times 10^{21}

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Solution

The correct option is A $4.8 \times 10^{20}$
In the given equation:
$4 K O_{2} (s) + 2 H_{2} O (g) 4 C O_{2} (g) \to 4 K H C O_{3} (s) + 3 O_{2} (g)$
$4 m o l e C O_{2}$ gives 3 mole $O_{2}$
$= 7.977 \times 10^{- 4} m o l$
Number of molecules of oxygen gas produced is:
$O_{2} = 7.977 \times 10^{- 4} \times 6.023 \times 10^{23}$
$= 4.8 \times 10^{20}$

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Similar questions

Potassium superoxide,

K O_{2}

, is utilised in closed system breathing apparatus. Exhaled air contains

C O_{2}

and

H_{2} O

both of which are removed and the removal of water generates oxygen for breathing by the reaction:

4 K O_{2} (s) + 2 H_{2} O (l) \to 3 O_{2} (g) + 4 K O H (s)

. The potassium hydroxide removes

C O_{2}

from the appratus by the reaction:

K O H_{s w} + C O_{2} (g) \to K H C O_{3} (s)

The mass of

K O_{2}

generating

48

g of oxygen is :

Q. Some older emergency oxygen masks containing potassium superoxide

(K O_{2}))

react with

C O_{2}

and water in exhaled air to produce oxygen according to the given equation.

4 K O_{2} + 2 H_{2} O + 4 C O_{2} \to 4 K H C O_{3} + 3 O_{2}

If a person exhales

0.667 g

C O_{2}

per minute, how many grams of

K O_{2}

are consumed in 5.0 minutes?

Q. Which of the following reactions of potassium super oxide supply oxygen gas in the breathing equipments used in space and submarines ?
(1) Reaction of superoxide with nitrogen in the exhaled air.
(2) Reaction of superoxide with moisture in the exhaled air.
(3) Reaction of superoxide with carbon dioxide in the exhaled air

$K O_{2}$ finds use in breathing equipment to safeguard the user to breathe in oxygen generated internally in the apparatus without being exposed to toxic fumes outside. The supply of oxygen is due to :

i.Slow decomposition of $K O_{2}$

ii.reaction of superoxide with moisture in the exhaled air

iii.reaction of $K O_{2}$ with $C O_{2}$ in the exhaled air

Q. Breathing is the process during which ______ is inhaled and carbon dioxide is exhaled.

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The correct option is A 4.8×1020In the given equation:4KO2(s)+2H2O(g)4CO2(g)→4KHCO3(s)+3O2(g)4moleCO2 gives 3 mole O2 =7.977×10−4molNumber of molecules of oxygen gas produced is: O2=7.977×10−4×6.023×1023=4.8×1020