Potassium superoxide can be used to remove carbon dioxide from a fas mixture. wh

Question

Potassium superoxide can be used to remove carbon dioxide from a fas mixture.

what mass of KO2 would be needed to react with 50 L of CO2 at 25 C and 0.50 atm.

Whenever I solve this question, I get the answer 150g. However, it states here that the answer is 1.5g. Am I correct? or is there a way to solve it that one would get 1.5g? Thanks :)

p/3072287 /mod resource/content/6/sP 16.pdf SCICHEM 1000 3.0 A 0. 5. Potassium superoxide can be used to remove carbon dioxide from a gas mixture 4KO2(s) 2CO2(g) 2 K2CO3(s) + 3O2(g) What mass of KO2 would be needed to react with 50 L of CO2 at 25°C and 0.50 atm?

Explanation / Answer

1st calculate the number of mols of CO2
Given:
P = 0.5 atm
V = 50.0 L
T = 25.0 oC
= (25.0+273) K
= 298 K

find number of moles using:
P * V = n*R*T
0.5 atm * 50 L = n * 0.08205 atm.L/mol.K * 298 K
n = 1.022 mol

from reaction,
moles of KO2 = (4/2)*moles of CO2
= (4/2)*1.022 moles
= 2.044 moles

Molar mass of KO2,
MM = 1*MM(K) + 2*MM(O)
= 1*39.1 + 2*16.0
= 71.1 g/mol

use:
mass of KO2,
m = number of mol * molar mass
= 2.044 mol * 71.1 g/mol
= 145 g
Answer: 145 g

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