Quantitive Chemistry

Question 1

Avogadro’s Number

Answer 1

6,02 x 10²³

Question 2

Number of moles using N

Answer 2

n = N/NA
n = number of mole (mol.)
N = number of particles (atoms, molecules/ions)
NA = Avogadro’s number = 6,02 x 10²³ particles

Question 3

Number of moles using m

Answer 3

n = m/M
n = number of moles (mol.)
m = mass (grams)
M = molar mass (g.mol⁻¹)

Question 4

Number of moles STP

Answer 4

n = V/Vm
n = number of moles (mol.)
V = volume (dm³)
Vm = molar volume at STP = 22,4 dm³.mol⁻¹