Lacey_Che131_S2012_Lect-16s

Lacey_Che131_S2012_Lect-16s - Review Calculate the heat...

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Lec-16: Gasses; Pressure, Gas Laws Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 1 Review alculate the heat released when sulfur is burned in 2S(s) + 3O 2 (g) 2SO 3 (g) H = ? Calculate the heat released when sulfur is burned in oxygen: 1) S(s) + O 2 (g) SO 2 (g) H= -297 kJ 2) 2SO 2 (g) + O 2 (g) 2SO 3 (g) H= - 198 kJ Step 1 2 S(s) + 2 O 2 (g) 2 SO 2 (g) H = - 594 kJ Step 2 2 SO 2 (g) + O 2 (g) 2 SO 3 (g) H = - 198 kJ Add 2S (s) + 3O 2 (g) + 2SO 2 (g) 2SO 2 (g) +2 S O 3 (g) H = - 792 kJ Net 2S (s) + 3O 2 (g) 2 SO 3 (g) H = - 792 kJ Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 2 Gasses ` There are three phases for all substances: solids, liquids and gases . ` Gases are highly compressible and occupy the full volume of their containers. h i bj t d t it l ` When a gas is subjected to pressure, its volume decreases. ` Gases always form homogeneous mixtures with other yg gases. ` Gases only occupy about 0.1 % of the volume of their ontainers containers. A Gas is typically Characterized by , V, T, ( S t a t e ) Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 3 P, V, T, P, V, T, n (State) n Gasses Earth is surrounded by a layer of gases 50 km thick ravity exerts a force on We live in a solution of gasses Gravity exerts a force on the earth’s atmosphere columnofair1m 2 A column of air 1 m A column of air 1 m in in cross section exerts a force of 10 5 N.
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Lacey_Che131_S2012_Lect-16s - Review Calculate the heat...

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