1 After each treatment, checking the hair and combing with a nit comb to remove nits and lice every 2â3 days may decrease the chance of selfâreinfestation. 2  Continue to check for 2â3 weeks to be sure all lice and nits are gone.
In chemistry, the molar mass M is a physical property defined as the mass of a given substance (chemical element or chemical compound) divided by the amount of substance. The base SI unit for molar mass is kg/mol. However, for historical reasons, molar masses are almost always expressed in g/mol.
1 Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). ( 2 1 u is equal to 1/12 the mass of one atom of carbon-12). 3  Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol. (1 u is equal to 1/12 the mass of one atom of carbon-12). 2  Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol.