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Sodium carbonate, na2co3(s), can be prepared by heating sodium bicarbonate, nahco3(s). 2nahco3(s) > na2co3(s) + co2(g) + h2o(g) kp = 0.23 at 100ºc if a sample of nahco3 is placed in an evacuated flask and allowed to achieve equilibrium at 100ºc, what will the total gas pressure be? 0.46 atm 0.96 atm 0.23 atm 0.48 atm 0.11 atm

Respuesta :

The equilibrium will be

[tex]NaHCO_{3} (s)--->Na_{2} CO_{3} (s)+CO_{2} (g)+H_{2}O(g)[/tex]

There is no gas in the reactant

The Kp expression for equilibrium will be

Kp = pH₂O X pCO₂

Given Kp =0.23

thus

0.23= pH₂O X pCO₂

The partial pressures of both will be equal, lets say "p"

0.23=p²

p=0.48

Total pressure = 0.48 + 0.48 = 0.96 atm

Answer is 0.96 atm

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