Moles and Gas Laws

Question 1

define a Mole

Answer 1

6.022 x 10^23 particles

Question 2

Equation to convert mass to moles?

Answer 2

Amount (mol) = mass (g) /
relative formula (or molecular) mass × Mu (g mol−1)

where:
- / = divide
- Mu = 1 g mol-1

Question 3

how to calculate Relative atomic mass (Ar) of a sample of an element made of different isotopes

Answer 3

Ar= m1 x abundance1 + m2 x abundance2 + m3 x abundance3 + … / abundance1 + abundance2 + abundance3 + …

where:
- m = mass
- / = divide

Question 4

boyle’s law equation?

Answer 4

p1V1 = p2V2

OR

V ∝ 1/P

Question 5

Charles’ law equation?

Answer 5

V1/T1 = V2/T2

OR

V ∝ T

Question 6

Gay-lussac’s law Equation?

Answer 6

p1/T1 = p2/T2

OR

P ∝ T

Question 7

Avogadro law equation

Answer 7

V1/n1 = V2/n2

OR

V ∝ n

Question 8

ideal gas law equation

Answer 8

pV = nRT

where:

R = ideal gas constant

Question 9

kinetic gas equation?

Answer 9

pV = (mnCrms^2)/3

where:

m = mass
n = number of molecules
Crms = root mean squared velocity

Question 10

Graham’s law of diffusion equation?

Answer 10

Rate1 ∝ 1 / √M1

where:
- Mx (eg: M1) = molecular mass of gas “x”

Question 11

Graham’s 2nd law of diffusion equation?

Answer 11

Rate1 / Rate2 = √(M2/M1)

where:
- Mx = molecular mass of gas “x”