Download presentation

Published byChristine Troupe Modified over 4 years ago

1
**Gas Stoichiometry Molar Volume of an Ideal Gas**

Standard Temperature & Pressure (STP) Using these with the Ideal Gas Law

2
**Using Stoichiometry and Gas Laws**

Calculate the volume of oxygen gas (O2) produced at 1.00 atm and 25oC by the incomplete decomposition of 10.5 g of potassium chlorate: 2KClO3 2KCl + 3O2 To solve the problem, we use what we know about moles and the ideal gas law: Convert grams of KClO3 to moles Use a mole ratio to determine moles of O2 Calculate the volume of O2 using the ideal gas law 1) 10.5 g KClO3 x 1 mol KClO3 = mol KClO3 122.6 g KClO3 3) Use the ideal gas law: PV = nRT P = 1.00 atm n = mol V = ? T = 25oC 298 K V = (0.128 x x 298) = 3.13 L 1.00 2) mol KClO3 x 3 mol O2 = mol O2 2 mol KClO3

3
**STP: Standard Temperature and Pressure**

1 mole of an ideal gas at 0oC (273 K) and 1 atm has a volume of 22.4 L This volume is called the molar volume of an ideal gas. STP = the conditions of 0oC and 1 atm V = nRT = (1.00 mol)( )(273 K) = 22.4 L P atm 1 mol of ANY ideal gas has a volume of 22.4 L at STP: Equivalence statement: mol = 22.4 L (STP)

4
Calculating using STP A sample of nitrogen gas has a volume of 1.75L at STP. How many moles of N2 are present? We can take a shortcut to the ideal gas law by using the molar volume of an ideal gas at STP: 1.000 mol = 22.4 L (STP) SO… 1.75 L x mol N2 = mol N2 22.4 L N2

5
**Reactions Involving Gases at STP**

Quicklime (CaO) is produced by heating calcium carbonate (CaCO3). Calculate the volume of CO2 produced at STP from the decomposition of 152 g of CaCO3 according to the reaction: CaCO3 CaO + CO2 Step 1: Convert the mass of CaCO3 to moles 152 g CaCO3 x 1 mol CaCO3 = 1.52 mol CaCO3 100.1 g CaCO3 Step 3: Use the molar volume of an ideal gas at STP to determine volume of CO2 1.52 mol CO2 x 22.4 L CO2 = 34.1 L CO2 1 mol CO2 Step 2: Determine moles of CO2 using a mole ratio 1.0 mol CaCO3 x 1 mol CO2 = 1.52 mol CO2 1 mol CaCO3

6
**Gas Stoichiometry Practice Problems**

Calcium oxide can be used to “scrub” carbon dioxide from air: CaO + CO2 CaCO3 What mass of CO2 could be absorbed by 1.25 g of CaO? What volume would this CO2 occupy? For the reaction 4Al + 3O2 2Al2O3 What volume of oxygen gas at STP would be needed to react completely with 1.55 g of aluminum? An ideal gas has a volume of 50.0 mL at 100oC and a pressure of 690 torr. Calculate the volume of this sample of gas at STP. A gaseous mixture contains 6.25 g of He and 4.97 g of Ne. What volume does the mixture occupy at STP? Using the unbalanced equation: Na + Cl2 NaCl What volume of chlorine gas, measured at STP, is necessary for the complete reaction of 4.81 g of sodium metal?

Similar presentations

Presentation is loading. Please wait....

OK

Stoichiometry.

Stoichiometry.

© 2018 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google

A ppt on nanotechnology Ppt on asp dot net project Ppt on sexually transmitted diseases Ppt on vehicle testing Ppt on real numbers for class 9th result Ppt on seven stages of life Ppt on gujarati culture association Ppt on area of parallelogram and triangles for class 9 Ppt on division for class 3 Ppt on formation of day and night