2.1.3 Amount Of Substance

Question 1

Amount of substance

Answer 1

Quantity used to count the number of particles (atoms, ions, molecules) in any species, measured in moles.

Question 2

Mole

Answer 2

Unit for the amount of substance (mol)

Question 3

the Avogadro Constant

Answer 3

number of particles per mole (mole^-1)

1 mole has 6.02 x 10^23 particles

Question 4

Molar mass

Answer 4

mass per mole (g mol^-1) for any chemical substance

Question 5

Molar gas volume

Answer 5

volume per mole of gas molecules (dm^3 mol^1)

Question 6

Empirical formula

Answer 6

Simplest whole number ratio of atoms of each element present in a compound

Question 7

Molecular formula

Answer 7

Number and type of atoms of each element in a molecule

Question 8

Ideal gas equation

Answer 8

pV = nRT

p = Pressure (Pa)
V = volume (m^3)
n = amount (mol)
R = ideal gas constant (8.31 J mol^1 K^-1)
T = temperature (K)

Question 9

Percentage yield

Answer 9

Actual yield / theoretical yield x 100

Question 10

Atom economy

Answer 10

Sum of Mr of desired products / sum of Mr of all products x 100