Equations

Question 1

Molarity equation

Answer 1

M1V1 = M2V2
M = mol
V = volume

(a)MaVa = MbVb(b)
for acid-base reactions

Question 2

Boyle’s law

Answer 2

P1V1 = P2V2

The volume of a given amount of gas held at a constant temperature is inversely proportional to the pressure under which it is measured
P = pressure
V = volume

Question 3

Charles’ Law

Answer 3

V1/T1 = V2/T2

Volume of gas is proportional to its temperature on the Kelvin scale when pressure is held constant
V = volume
T = temperature (K)
K = °C +273

Question 4

Gay-Lussac’s Law

Answer 4

P1/T1 = P2/T2

The pressure of a gas is proportional to its temperature on the Kelvin scale when the volume is held constant
P = pressure
T = temperature

Question 5

Avogadro’s Law

Answer 5

V1/n1 = V2/n2

For a confined gas, the volume and number of moles are directly proportional if the pressure and temperature remain constant
V = volume
n = number (in moles)

Question 6

Ideal Gas Law

Answer 6

PV = nRT

Shows the relationship between pressure, volume, temperature, and number of moles in a gas
P = pressure
V = volume
n = moles
R = ideal gas constant (0.08206 or 8.314)
T = temperature

Question 7

Ideal gas constant values and units (R)

Answer 7

0.08206 L·atm/mol·K
8.314 kPa·L/mol·K
62.364 L·mmHg/K·mol

Question 8

Combined Gas Law

Answer 8

P1V1/T1 = P2V2/T2

Use if the moles are kept constant

Question 9

Molar mass of a gas

Answer 9

M = dRT/P

M = molar mass of the gas
d = density
R = ideal gas law constant
T = temperature
P = pressure

Question 10

1 atm equals:

Answer 10

760 mmHg
101325 Pa
14.7 lb/in^2

Question 11

What is STP?

Answer 11

Standard temperature and pressure
273.15 K and 1 atm

Question 12

What is the standard molar volume of an ideal gas?

Answer 12

22.4 L