Question

the no of atoms in 3.2g of oxygen gas are??​

Answer 1

Answer:

6.02×10²²

Explanation:

molar mass of oxygen gas=32g/mol

moles=mass/molar mass=3.2/32=0.1mol

no of moles =no of atoms/Avogadro number

0.1=no of atoms/6.02×10²³

=0.1×6.02×10²³=6.02×10²²

Answer 2

Answer:

$12.044 * 10^{2}$

Explanation:

by using the mole concept  

 

           no of atoms = given mass/ molar mass x Avogadro's no.

                               = 32/ 16 x 6.022x10²³  

                                = 12.044x10²³