Lecture%205%20part%20II%20Chem%20102

# Lecture%205%20part%20II%20Chem%20102 - Chapter 5 Gas part...

This preview shows pages 1–7. Sign up to view the full content.

Chapter 5 Gas part II

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

View Full Document
Gas Stoichiometry Example 1. What is the volume at STP of 4.00 g of CH 4 ? Example 2. How many L of O 2 are needed to react 28.0 g NH 3 at 24°C and 0.950 atm? 4 NH 3 (g) + 5 O 2 (g) 4 NO(g) + 6 H 2 O(g)
Ideal Gas Law Problems Consider the decomposition of Calcium carbonate. 1:1 mole ratio so you produce 0.3 mol CaO CaCO 3 (s) Î CaO(s) + CO 2 (g) This reaction produces 0.3 mol CO 2 how much CaO is produced? PV = nRT, g CaO = 52g/n (0.0304n) => 0.0304 mol CaO If the reaction produced 732 mL of CO 2 at 21°C and 77.1 cm Hg, how much CaO is produced? 1:1 n ratio want g CaO! n = PV/RT = 1.015 atm(0.732L)/(0.0832 L atm/mol K)(294) = 0.0304 mol = 1.58 g

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

View Full Document
Molar Mass Determination Example 3. What is the molar mass of a gas if 0.250 g of the gas occupy 215 mL at 0.813 atm and 30.0°C? 4
Dalton’s Law of Partial Pressures For a mixture of gases in a container, P Total = P 1 + P 2 + P 3 + . . . The total pressure exerted is the sum of the pressures that each gas would exert if it were alone. P 1 , P 2 , P 3 – partial pressure of individual gas Each gas behaves as ideal gas V RT n V RT n n P V RT n P V RT n P total total = + = = = ) ( ,.... , 2 1 2 2 1 1 Note: temperature and volume are the same

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

View Full Document
Example 4. 27.4 L of oxygen gas at 25.0°C and 1.30 atm, and 8.50 L of helium gas at 25.0°C and 2.00 atm were pumped into a tank with a volume of 5.81 L at 25°C. Calculate the new partial pressure of
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 25

Lecture%205%20part%20II%20Chem%20102 - Chapter 5 Gas part...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online