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 1 mole of a pure substance has a mass equal to its molecular mass expressed in grams. & 2 nbsp This is known as the molar mass, M, and has the units g mol -1. & 3 nbsp &nbsp &nbsp So 2 moles of a substance would have a mass = 2 x molar mass.