Lacey_Che131_S2012_Lect-16s

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

This preview shows pages 1–2. Sign up to view the full content.

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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 6

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online