Question

What symbol is used to denote molality?

• A. M
• B. m
• C. mM
• D. n

Answer 1

The correct option is B m

Universally, 'm' is used to denote molality concentrations. Example: 2 m means a solution having concentration 2 molal (2 moles of solute/kg solvent).
'M' is used to molarity. E.g. 2 M means a solution having concentration 2 molar (2 moles of soute/L solution).
'mM' corresponds to milli-molar concentration and 'n' denotes number of moles of a component.