Lecture 12

Question 1

What is Avogrado’s Law?

Answer 1

V=k(sub A) n

Question 2

In Avogrado’s law, what does n variable stand for?

Answer 2

number of moles

Question 3

What is the result of Avogrado’s Law?

Answer 3

molar volumes of all gases are about the same

Question 4

at 273k and 1 atm, the molar volume of gases is _____

Answer 4

22.4L

Question 5

What is the molecular explanation for Avogradro’s Law?

Answer 5

In an ideal gas situation, molecules are not able to distinguish between each other

Question 6

What does STP stand for?

Answer 6

standard and temperature and pressure

Question 7

What is STP?

Answer 7

273k and 1 atm

Question 8

What is the ideal gas law equation?

Answer 8

PV=nRT

Question 9

What is R when the unit is L(atm)/ mol (k)

Answer 9

0.08206

Question 10

What is R when the unit is J/mol (k)

Answer 10

8.314

Question 11

What is the equation of molar mass?

Answer 11

mass/ number of moles

Question 12

What is the law equation for molar mass?

Answer 12

MM=mRT/ PV

Question 13

What is the law equation for density?

Answer 13

(m/v)(RT/p)=dRT/p

Question 14

What is 1 atm in Torr?

Answer 14

760 torr

Question 15

What is Dalton’s Law of Partial Pressures?

Answer 15

Pressure exerted by mixture of ideal gases is sum of pressures exerted by individual gases occupying the same volume alone

Question 16

What is the equation for P (tot)

Answer 16

P(tot)= P(a)+P(b)+ P(c)+ P (etc)

Question 17

What is the mole fraction equation?

Answer 17

PN2= XN2Ptot

Question 18

What is the kinetic molecular theory?

Answer 18

1. gases are seen as balls that randomly collide
2. energy depends on temperature
3. spend most of their time far away from other molecules

Question 19

What is the equation for molar (average) kintetic energy of one mole of any gas?

Answer 19

KE= 3/2 RT

Question 20

What is R in the kintetic energy equation?

Answer 20

8.31 J/ k(mol)

Question 21

molar kinetic energy is also proportional to _____

Answer 21

velocity (u)

Question 22

What is the equation with u and kintetic energy?

Answer 22

KE= 1/2 MM (u)^2

Question 23

What are the four postulates for the kinetic molecular theory?

Answer 23

1. particles are so small compared with the distances between them that the volume of the individual particles can be assumed to be 0
   2.particles are in constant motion
2. particles are assumed to exert no forces on each other
3. average kintetic energy of collection of gas

Question 24

What is the correct form of U (sub rms)?

Answer 24

= square root (3RT/MM)