Chemisty Formulas

Question 1

Moles Formula?

Answer 1

n
———
mr | m

N (Moles) =
Mass (g) / Mr (g/m)

Question 2

Empirical Formula Definition?

Answer 2

Smallest ration of atoms in a molecule.

Question 3

Concentration Formula?

Answer 3

Mass (g)
————
Volume (dm3)

= Concentration (g dm-3)

Question 4

Rf Value?

Answer 4

Distance travelled by the solute
———————————————
Distance travelled by solvent,

This is used to work out chromatograms (in chromatography),

Measure baseline to spot to find “distance by solute) and then baseline to top of paper (where the solvent has moved to).