Calculations

Question 1

Mass spectrometer calculation

Answer 1

Relative atomic mass = sum of (isotope x %) / 100

Question 2

Moles

Answer 2

Moles = mass/ molar mass
Moles = number of particles / Avagadro’s number

Question 3

Concentration calculation

Answer 3

Concentration (moldm^-3) = moles / volume (dm)

Question 4

Gas volume concentration

Answer 4

Gas volume (dm^3) = moles x 24

Question 5

Calculating pH

Answer 5

-log10 [H+/conc] = pH