One step in the manufacture of solar cells is the growth of solid silicon from g

Question

One step in the manufacture of solar cells is the growth of solid silicon from gas feed. Consider a feed source of pure chlorosilane that undergoes the following reaction:

SiH3Cl1 (g) <->Si(s) <-> HCl(g) + H2(g)

You are considering a process that runs at 500°C and 100 Pa. Answer the following questions.

(a) What is the maximum amount of Si product you can make for each mole of SiClH3 fed into the reactor? You may assume del_H°rxn is const.

(b) What data would you need to calculate an answer without assuming del_H°rxn is const? How would that change your calculation?

Explanation / Answer

The balanced reaction is : SiClH3(g) ----> Si(s) + HCl (g) + H2(g)

Molar mass (g/mol) 66.5 28

From the above balanced reaction ,

1 mol = 66.5 g of SiClH3 produces 1 mol= 28 g of Si

So the maximum amount of Si produced is 28 g of Si

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