there is a large difference between Solid hydroxide is anhydrous and hygroscopic

Question

there is a large difference between Solid hydroxide is anhydrous and hygroscopic. So it is necessary to keep the pellets stoppered or protected from the atmosphere because they will absorb moisture from the air. Determine the enthalpy change for the reaction indicated below. delta H is equal to -439 kcal/mol (0 dec places) The delta H for the reverse of this reaction would be equal to +439 kcal/mol (o dec places) S(s) + O_2(g) ====== SO_2 delta H = -417, cal SO_2 (g) + 1/2 O_2 (g) ====== SO_3 (g) delta H = -22 kcal S(s) + 3/2 O_2 ====== SO_3 (g) delta H = ?

Explanation / Answer

Ans 3.

Solid sodium hydroxide is anhydrous and hygroscopic. So it is necessary to keep the pellets sloppered or protected from the atmosphere because they will absorb moisture from the air.

The crystals are so hygroscopic and they readily dissolve in water, the property called as deliquescence

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