How many moles of helium are equivalent to 1.5 x 1023 atoms? Round to 2 places after the decimal.
Type in numerical answer. Do not include units for this answer.

fe 55.85 g/mol and h2o 18.02 g/mol.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.