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Ch. 5, 6 A What is AH rxn for the following reaction? SIO2 (s) + 4HCl(g) → SiCl4(g) + 2H20(9) Substance AH {(kJ/mol) SIO2(5)
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Answer #1

Consider reaction, SiO2 (s) + 4 HCl (g) \rightarrow SiCl 4 (g) + 2 H2O (g)

We can calculate \Delta H0 rxn by using equation, \Delta H0 rxn = 1585171676046_blob.png1585171676133_blob.pngH 0 f ( products ) -  1585171676036_blob.png1585171676134_blob.pngH 0 f ( reactants )

Let's calculate 1585171676042_blob.png1585171676126_blob.pngH 0 f (products) and 1585171676050_blob.png1585171676148_blob.pngH 0 f (reactants) .

1585171676042_blob.png1585171676126_blob.pngH 0 f (products) = 1585171676111_blob.pngH 0 fSiCl 4 (g) + 2 1585171676125_blob.pngH 0 f H2O (g)

1585171676050_blob.png1585171676148_blob.pngH 0 f (products) = (- 662.8 kJ mol -1 )  + 2 ( - 241.8 kJ mol -1 )

1585171676050_blob.png1585171676148_blob.pngH 0 f (products) = - 1146.4 kJ mol -1

1585171676036_blob.png1585171676134_blob.pngH 0 f ( reactants ) = 1585171676111_blob.pngH 0 f SiO2 (s) + 4 1585171676125_blob.pngH 0 f HCl (g)

1585171676036_blob.png1585171676134_blob.pngH 0 f ( reactants ) = (- 859.2 kJ mol -1 )  + 4 ( -92.3 kJ mol -1 )

1585171676036_blob.png1585171676134_blob.pngH 0 f ( reactants ) =  (- 859.2 kJ mol -1 ) - 369.2  kJ mol -1

1585171676036_blob.png1585171676134_blob.pngH 0 f ( reactants ) = - 1228.4 kJ mol -1

\therefore\DeltaH0 rxn = - 1146.4 kJ mol -1- ( - 1228.4 kJ mol -1)

\DeltaH0 rxn = 82.0 k J / mol

ANSWER : \Delta H0 rxn = 82.0 k J / mol

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