Ideal Gas Law Versus Real Gas Law

Ideal Gas Law

Advanced Mole

Ideal Gas Law

PV = nRT

where...

Dropdown

In the ideal gas law, P = ​

Select answer

, V = ​

Select answer

, n = ​

Select answer

, R = ​

Select answer

, and T = ​

Select answer

A Picky Law

The Ideal Gas Law is considered picky because there are specific units you must use.

If a variable is not in the correct unit, you must convert it!

*All conversions are on the back of your periodic table*

Multiple Choice

Select the option that has all 5 variables in the correct units

• P = kPa

  V = L

  n = grams

  R = $$0.0821\ \frac{L\cdot atm}{mol\cdot K}$$

  T = Celsius

• P = atm

  V = mL

  n = moles

  R = $$0.0821\ \frac{L\cdot atm}{mol\cdot K}$$

  T = Kelvin

• P = atm

  V = L

  n = mole

  R = $$0.0821\ \frac{L\cdot atm}{mol\cdot K}$$

  T = Kelvin

• P = Pa

  V = L

  n = mole

  R = $$0.0821\ \frac{L\cdot atm}{mol\cdot K}$$

  T = Celsius

Ideal Gas Law Example

If 0.867 moles of nitrogen trioxide is collected at 305.2 K and 721 mmHg, what volume of nitrogen trioxide is present?

Multiple Select

What are our known values? You can pick more than one

• P

• V

• n

• R

• T

Multiple Choice

What is our unknown value?

• P

• V

• n

• R

• T

Drag and Drop

The ​

Placeholder

value is in the wrong unit. To convert to ​

Placeholder

, we need to ​

Placeholder

721 mmHg by ​

Placeholder

Drag these tiles and drop them in the correct blank above

pressure

atm

divide

760 mmHg

kPa

101.325 kPA

multiply

temperature

Ideal Gas Law Example

After converting 721 mmHg to atm,

P = 0.949 atm

V = ?

n = 0.867 moles

R = 0.0821 L*atm/mol*K 

T = 305.2 K

Labelling

Place the following values in the correct spot

Drag labels to their correct position on the image

305.2 K

0.949 atm

0.867 mole

Ideal Gas Law Example

Let's try another one!

Multiple Select

What are our known values? You can select more than one!ˆ

• P

• V

• n

• R

• T

Multiple Choice

What is our unknown value?

• P

• V

• n

• R

• T

Drag and Drop

The ​

Placeholder

value is in the wrong unit. To convert from ​ ​

Placeholder

to ​

Placeholder

, we need to ​

Placeholder

273.15.

Drag these tiles and drop them in the correct blank above

temperature

Kelvin

add

pressure

subtract

Ideal Gas Law Example #2

After converting from Celsius to Kelvin,

P = 1.21 atm

V = 0.2598 L

n = ?

R = 0.0821 L*atm/mol*K

T = 295.85 K

Labelling

Place the following values in the correct spot

Drag labels to their correct position on the image

0.2598 L

1.21 atm

295.86 K

Multiple Choice

Yay! We solved for moles

n = 0.0129 mol SO₃

But are we done?

• Yep!

• No - we need to convert to grams

Dropdown

To convert to grams, we need to use ​

Select answer

Math Response

Calculate the molar mass of SO₃

Type answer here

Correct Answer: 80.07

Deg^°

Rad

Labelling

Place the following values in the correct spot

Drag labels to their correct position on the image

0.0129

mole

1 mole

grams

80.07

Math Response

Almost to the end! How many grams of SO₃ do you have? Use correct significant figures!

Type answer here

Correct Answer: 1.03

Deg^°

Rad