Please Explain it thoroughly as well. Thanks Consider the reaction of sodium per

Question

Please Explain it thoroughly as well. Thanks

Consider the reaction of sodium peroxide (Na_2O_2) to eliminate carbon dioxide (CO_2) build-up in airtight spaces such as submarines, shown in this balanced chemical equation: 2 Na_2O_2 (s) + 2 CO_2 (g) rightarrow 2 Na_2CO_3 (s) + O_2 (g) If an excess of Na202is added to a rigid flask filled with CO_2, how will the total pressure before the reaction (P_initial) compare to the total pressure after the reaction goes to completion (P_final)? Assume that the volume of the solids is negligible and that the temperature is constant. P_final P_initial Not enough information to decide

Explanation / Answer

From the reaction stoichiometry we see that as the reaction proceeds, the number of moles of gas decrease, because the reactant side contains more moles of gas as compared to the product side, so the total gaseous moles decreases as the reaction completes which causes a decrease in pressure.

So correct answer is:

(a) Pfinal < Pinitial

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