# Ideal Gas Law

Warmup 1/5/16

If we add more gas to a balloon, what changes?

## Objective

To complete how we model an ideal gas

## Tonight’s Homework

pp 481: 1, 2, 3, 4

Notes on Ideal Gas Law

We can now model almost any gas in any way, but we need to add one more piece.

We haven’t taken into account yet what happens if we simply change how much gas we have.

Notes on Ideal Gas Law

We can now model almost any gas in any way, but we need to add one more piece.

We haven’t taken into account yet what happens if we simply change how much gas we have.

If I imagine a balloon filled with gas, we can ask what happens if we pump more gas into it.

Notes on Ideal Gas Law

We can now model almost any gas in any way, but we need to add one more piece.

We haven’t taken into account yet what happens if we simply change how much gas we have.

If I imagine a balloon filled with gas, we can ask what happens if we pump more gas into it.

Either the pressure goes up, or the volume goes up.

Notes on Ideal Gas Law

This gives us all the pieces we need for the

Ideal Gas Law.

PV = nRT

Notes on Ideal Gas Law

This gives us all the pieces we need for the

Ideal Gas Law.

PV = nRT

Pressure in kPa volume in dm 3 number of moles gas constant (=8.31) temperature in K

Notes on Ideal Gas Law

Example: What is the pressure of 4.5 moles of a gas in a 198 dm 3 container at a temperature of

8 ° C?

Notes on Ideal Gas Law

Example: What is the pressure of 4.5 moles of a gas in a 198 dm 3 container at a temperature of

8 ° C?

PV = nRT P = nRT

V

P =

(4.5)(8.31)(273+8)

(198)

P = 53.1 kPa

Notes on Ideal Gas Law

Example: What is the pressure of 4.5 moles of a gas in a 198 dm 3 container at a temperature of

8 ° C?

PV = nRT P = nRT

V

P =

(4.5)(8.31)(273+8)

(198)

P = 53.1 kPa

The only thing to watch out for in practicing with this is your units. Make sure you have the units listed before this example problem.

Practicing Ideal Gas Law

One last practice set for the semester.

Turn to page 495 and do the following:

38, 39, 40, 41, 42, 43

Exit Question

Solve using the ideal gas law:

P=200 kPa, n=7 mol, T=327 K, V=?

a) 457,800 dm 3 b) 3,804,318 dm 3 c) 11.45 dm 3 d) 95.11 dm 3 e) 0 f) None of the above