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.
The mass of one mole of an element or compound is called its molar mass (symbol M). The molar mass of copper is 63.5 g mol -1. The molar mass of sodium hydroxide is 40 g mol -1. There is a quantity that relates to the number of particles in a mass of substance. This quantity is called the amount of substance.