chapter 8: Gas phase

Question 1

What do we call the approximation model used to predict the behavior of a gas?

Answer 1

Ideal gas law.

Question 2

What are the 2 rules for an ideal gas?

Answer 2

1) ideal gas molecules to not atttract or repel each other. they can only do elastic collision.
2) Individual gas molecules take up NO volume, gas as a whole can take up volume - not individual molecules.

Question 3

Which equation can we use to approximate the moles of gas in space?

Answer 3

Ideal Gas Law:

PV = nRT
P = pressure
V = volume
n = # of moles
R = Gas constant (0.082 Latm/kmole) or 8.31 J/k*mol.
T = temperature in kelvin.

Question 4

How can you convert from mole to # of molecules?

Answer 4

Mole x (6.02x10^23 mol/L) = Molecules
We multiply moles by avogadros number!

Question 5

What is atmospheric pressure in Pa?

Answer 5

101300 Pa

Question 6

What is atmospheric pressure in ATM?

Answer 6

1 atm

Question 7

What is atmospheric pressure in kPa?

Answer 7

101.300 kPa

Question 8

What is normal body temperature in farhenhiet?

Answer 8

98 Degrees F

Question 9

What is normal body temperature in celsius?

Answer 9

38 C

Question 10

What is normal body temperature in kelvin?

Answer 10

310 K

Question 11

How can you convert from farhenhiet to celsius?

Answer 11

C = (F-32) x (5/9)

Question 12

How can you convert from celsius to farhenhiet?

Answer 12

F = (C x 9/5) + 32

Question 13

How can you convert between celsius and kelvin?

Answer 13

1 C = 273.15 K.

C + 273.15 = K
K - 273.15 = C

Question 14

What is the freezing temperature of water in celsius, farhenhiet, and kelvin?

Answer 14

0 C
32 F
273.15 K

Question 15

What is the boiling point of water in celsius, farhenhiet, and kelvin?

Answer 15

100 C
212 F
373.15 K

Question 16

The air in a basketball has a pressure of 1.54 atm and the ball has a volume of 0.00706 m^3. Assume the temperature of the air inside the ball to be 25 degrees celsius. (gas constant = 8.32 J/K*Mol). What is the # of moles of air inside the ball?

a. 0.55 Moles
b. 0.44 Moles
c. 0.90 Moles
d. 0.67 Moles

Answer 16

0.44 Moles

Question 17

How can you convert between atm and Pascals?

Answer 17

1 atm = 101300 Pa

atm x 101300 = Pa
Pa/101300 = atm

Question 18

A sample of N2 gas takes up a volume of 2.5 L at a pressure of 1.20 atm and a temperature of 300 K. How many molecules of N2 are present?

a. 7 x 10^22 molecules
b. 9 x 10^23 molecules
c. 3 x 10^22 molecules
d 1 x 10^22 molecules.

Answer 18

7 x 10 ^22 molecules.

Question 19

How much volume does 1 mole of gas take up at 273 K?

Answer 19

22.4 L

Question 20

What volume does 1 mole of gas occupy?

Answer 20

22.4 L

Question 21

A patient must recieve at least 2.5 moles of gas each minute ot maintain normal O2 saturation. An EMT’s BVM has a volume of 4 L. At a temp of 273 K, the EMT should squeeze the bag every:

a. 6 s.
b. 10 s.
c. 22 s.
d. 4 s.

Answer 21

d - 4 s

2.5 Mole x 22.4 L = 56 L per minute
56 L/4 L = 14 Squeezes per minute
60 s/14 = 4.28 s.