Quantitative Chemistry 2

Question 1

What is 1 dm³ in cm³?

Answer 1

1000 cm³

Question 2

State the equation linking number of moles, mass and Mr. Give units

Answer 2

Mol = mass / relative atomic mass

Mass (g) = Mr x N
Mr = mass / N

Mass
N Mr

Question 3

State the equation linking number of moles, concentration and volume. Give units

Answer 3

Conc (C) = number of mol (N) / volume (dm³)

N = C x V (dm³)

N
C V

Question 4

State the equation for Avogadros law on gases (at room temp and pressure). Give units

Answer 4

Volume = number of moles x 24

V = N x 24

dm³ = mol x 24

V
N | 24

Question 5

State Avogadro’s law (2)

Answer 5

• equal volumes of gas contain the same number of particles
• under the same conditions of temperature and pressure