How do you get moles Chemistry?

Answer 1

The mole in chemistry is also called the chemist's dozen and is defined as the amount of material containing 6.0221421 X10^23 particles(This number is called Avogadro's number)

The value of mole is the number of particles in excactly 12 grams of c-12, so, if you have 12grams of c-12 , you will have 6.022x10^23 carbon atoms ,which is also a mol of C. For any other element a mol of that element is the Atomic Mass expressed as grams.

0.0265 g C find mol of C

plan

gC -> mol C

1 mol / 12.01 g C ( relationship; 1 mol C = 12.01 g C )

0.0265 g C x 1 mol C / 12.01 g C = 2.21 x 10 ^-3 mol C

to find atoms change to mol then times 6.022X10^23

3.10g Cu find Cu atoms

plan g -> mol cu -> atoms Cu

(3.10 g cu )x (1 mol Cu /63.55 g Cu ) ( 6.022 x 10^23 / 1 mol cu = 2.94 x 10^22 Cu atoms