Lecture 16 Gasses; Pressure, Gas Laws

# Lecture 16 Gasses; Pressure, Gas Laws - Lec-16 Gasses...

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Lec-16: Gasses; Pressure, Gas Laws Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 1 Review Calculate the heat released when sulfur is burned in 2S(s) + 3O 2 (g) 2SO 3 (g) H = ? 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 2011 2

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Hess’s Law Determine for the following reaction W(s) + C(graphite) WC(s) ΔΗ 23 22 (a) 2W(s) + 3O ( ) 2WO ( ); H= -1680.6 kJ (b) C(graphite) + O ( ) CO ( ); H= -393.5 kJ gs gg →Δ 2 (c) 2WC(s) + 5O ( ) 2WO ( ) C ); H 2 O( g →+ Δ = -2391.6 kJ 11 (a) + (b) + reverse (c) ×× Sum resulting equations 2 =-38.0 2 kJ ⇒ΔΗ Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 3 Gasses ` There are three phases for all substances: solids, liquids and gases . ` Gases are highly compressible and occupy the full volume of their containers. ` When a gas is subjected to pressure, its volume decreases. ` Gases always form homogeneous mixtures with other gases. ` Gases only occupy about 0.1 % of the volume of their containers containers. A Gas is typically Characterized by Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 4 P, V, T, n
Gasses Earth is surrounded by a layer of gases 50 km thick Wl i i lt i f Gravity exerts a force on We live in a solution of gasses Gravity exerts a force on

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Lecture 16 Gasses; Pressure, Gas Laws - Lec-16 Gasses...

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