Question

number of atoms in 8.21g in Lithium

Answer 1

Applications of the Avogadro's number:

Quantitative calculations of the amount of substances typically involves the mass and the moles. However, it is sometimes important to know the number of atoms in a particular mass or mole of an element or compound. The concept of converting moles to number of atoms, molecules, or ions requires the use of Avogadro's number, through the relation:

1

m

o

l

=

6.022

×

10

23

a

t

o

m

s

When the mass of the element or compound is initially given, the number of moles is determined using its molar mass. The molar mass

M

M

is a ratio between the mass

m

and number of moles

n

and takes the form:

M

M

=

m

n

Answer and Explanation: 1