Achemist has 2.0 mol of methanol (ch3oh). the molar mass of methanol is 32.0 g/mol. what is the mass, in grams, of the sample?

                 Mass  =  64 g

             Mole is the quantity of a substance that contains number of particles exactly equal to particles found in 12 g of Carbon-12. The number of particles are 6.022 × 10²³ also called as Avogadro Number. Mole is given as,

                         Mole =  Mass / Molar Mass     (1)

Data Given;

                  Mole  =  2.0 mol

                  M.Mass  =  32.0 g.mol⁻¹

                  Mass  =  ??

Solving equation 1 for Mass,

                  Mass  =  Mole × M.Mass

Putting values,

                  Mass  =  2.0 mol × 32.0 g.mol⁻¹

                 Mass  =  64 g

there are two significant figures.