11.4 Continued Notes

Multiple Choice

You have 3.5 L of H₂ (g) at STP. How many moles of gas are there?

• 22.4 mol
• 22.4 L
• 0.16 mol
• 0.16 L

​

Stoich Gas Bonus

2CO + O₂ −-> 2CO₂
How many liters of Carbon dioxide are produced from 10.0 L of Oxygen, at STP?

1. set up Extended T-bar
2. Remember mol:mol ratio

​(don't forget your units and formula)

​10.0 L O₂

22.4 L O₂

1 mol O₂

1 mol O₂

2 mol CO₂

1 mol CO₂

22.4 L CO₂

Multiple Choice

2CO + O₂ −-> 2CO₂

How many liters of Carbon dioxide are produced from 10.0 L of Oxygen, at STP?

• 10.0 L

• 20.0 L

• 5010 L

• 0.0199

Ideal Gas Law

An ideal gas is defined as one in which all collisions between atoms or molecules are perfectly elastic and in which there are no intermolecular attractive forces.

The ideal gas law can be viewed as arising from the kinetic (movement) and pressure of gas molecules colliding with the walls of a container.

​

A Picky Law

The Ideal Gas Law is considered picky because there are specific units depending on pressure unit.

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

​

​Pressure unit	​R Constant
​Pa	​8.314462
​atm	​0.0821

​Variable	​Symbol	​unit
Pressure	P	Pa or atm
Volume	V	L
​moles	​n	​moles
​Gas constant	​R	​L (pressure)
​Temperature	​T	​K

Equation ​PV=nRT

Match

Match the following

• P

• T

• V

• R

• n

Pa or atm

K

L

8.314462 or 0.0821

mol

• Pa or atm

• K

• L

• 8.314462 or 0.0821

• mol

Multiple Choice

If pressure is in Pa what R (gas constant) value do you use?

• 8.314

• 0.0821

• 83.21

Multiple Choice

If pressure is in atm what R (gas constant) value do you use?

• 8.314

• 0.0821

• 83.21

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

If 0.867 moles of nitrogen trioxide is collected at 305.2 K and 0.949 atm, what volume of nitrogen trioxide is present?

P = 0.949 atm

V = ?

n = 0.867 moles

R = 0.0821 L*atm/mol*K  

T = 305.2 K

Multiple Choice

If 0.867 moles of nitrogen trioxide is collected at 305.2 K and 0.949 atm, what volume of nitrogen trioxide is present?

• 22.89 L

• 4.87

• 43.87

Multiple Choice

What is our unknown value?

• P

• V

• n

• R

• T

Multiple Choice

Calculate the volume that a 0.323-mol sample of a gas will occupy at 265 K and a pressure of 0.900 atm.

• 7.18 L 
• 7.81 L
• 4.63 L
• 4.36 L

Multiple Choice

What volume will 27.3 g of nitrogen occupy at 720 mmHg and 20C?

• 22.4 L
• 0.404 L
• 24.8 L
• 12.8 L

Multiple Choice

What pressure will be exerted by 25 g of carbon dioxide at temperature of 25 C and a volume of 500 mL?

• 27.8 atm
• 0.0278 atm
• 0.0360 atm
• 36.0 atm

Multiple Choice

If the pressure exerted by a gas at 25 degrees C in a volume of 0.044 L is 3.81 atm, how many moles of gas are present?

• .002766 mole
• .0069 mol
• 2.766 mol
• 9.887 mol