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A-Titanium dioxide is a white pigment widely used in paint. It can be prepared b

ID: 903563 • Letter: A

Question

A-Titanium dioxide is a white pigment widely used in paint. It can be prepared by reacting titanium tetrachloride with water vapor in the gas phase. The second product in the reaction is hydrochloric acid (HCl).

-Write a balanced chemical equation for the preparation of titanium dioxide.

-How much heat is released during the production of one mole of titanium dioxide under standard state conditions?

B-

Consider the following hypothetical series of reactions:

DH (kJ/mol)

3B ----->2C + D

–125.

(1/2)A -----> B

150

E + A ----> D

350

Calculate DH for the following reaction: B ----> E + 2C

DH (kJ/mol)

3B ----->2C + D

–125.

(1/2)A -----> B

150

E + A ----> D

350

Explanation / Answer

Part A:

TiCl4(s) + 2H2O (g) -----> TiO2(s) + 4HCl(g)

Heat:

TiCl4 ------> Ti + 2Cl2 DH= 815.03 kJ/mol

2H2O ----> 2H2 + O2 DH= 2 x 241.82 kJ/mol= 483.64 kJ/mol

Ti + O2 ----> TiO2 DH= -938.72 kJ/mol

2H2 + 2Cl2 ----> 4HCl DH= 4 x -92.31= -369.24 kJ/mol

-------------------------------------------

TiCl4(s) + 2H2O (g) -----> TiO2(s) + 4HCl(g) DH= 815.03 + 483.64 + -938.72 + -369.24= -9.29 kJ/mol

Part B:

3B-----> 2C + D DH= -125

A ----->2B DH= 150 x 2= 300

D ----> E + A DH= -350

----------------

B -------> E + 2C DH= -125 + 300 -350= -175 kJ/mol

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