Amount of substance

Question 1

Ideal gas equation

Answer 1

pV = nRT
pressure x volume = no. of moles x gas constant x temperature
Pa, m^3, moles, J K^-1 mol^-1, K

Question 2

Atom economy equation

Answer 2

(Mr desired products)/(Mr reactants)x100

Question 3

Equation linking relative atomic mass, mass and no. of moles

Answer 3

Mr = mass / moles

Question 4

Percentage yield equation

Answer 4

(Actual / theoretical) x 100

Question 5

Define molecular formula

Answer 5

Actual number of atoms needed to make a molecule

Question 6

Define empirical formula

Answer 6

The simplest whole number ratio of atoms in a molecule

Question 7

Skeletal formula

Answer 7

Shows carbon - carbon bonds as lines, no hydrogens drawn apart from on functional groups

Question 8

Define displayed formula

Answer 8

Drawing all atoms and bonds within a molecule, including all hydrogens and carbons

Question 9

Define structural formula

Answer 9

A way of showing the arrangement of atoms but not the bonds between them
e.g. CH3CH2CH3 for propane