Question

Can anyone teach me about the calculation between the mole and the mass of substances ?

Answer 1

what is it that you don't understand ?

Answer 2

n -> mole
m -> mass
M -> molar mas
n=m/M or m= n*M

Answer 3

I get confused when the questions ask about ions and atoms.
I will post the questions later. Hope somebody can lend me a hand.

Answer 4

when the questions ask about the number of ions/atoms/molecules/particles then you find the Avogadro number of those in one mole.
number of ions/atoms/...= moles x Avogadro number