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.
By looking up the molar masses of the elements of the product and adding them together, you can determine the molar mass of the product. For example, the molar mass for Na is 22.99 g. The molar mass for Cl is 35.45. In NaCl2, there are 2 moles of Cl, so multiply 35.45 by 2.a + Cl2, which gives you NaCl2. Determine the mass of the product. When the experiment is completed, the mass is typically calculated by weighing the product with a gram balance. For example, the final mass of the product may be 202.0 grams of sodium chloride (NaCl2). Determine the molar mass of the product.