Find the number of moles in 3.70*10^-1 g of boron

i know boron is 10.811 and what do i do after?

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

An observation that requires measurement is called quantitative observable or qualitative

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.