A sample of sodium bicarbonate is placed in an evacuated container at allowed to reach equilibrium. What will be the total pressure?

Complete Question

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?

The value is  

Explanation:

From the question we are told that

   The equation is  

Generally the equilibrium partial pressure is mathematically represented as

Here  

    are partial  pressures of   gases

Note: when writing the formula for equilibrium partial pressure we consider only the gas in the reaction

Let assume that    

Generally   since they are both products of the reaction

  So  

From the question we are told that

So  

=>  

=>  

=>  

So

and

So the total pressure is

=>  

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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