Question

What is the mass of 0.5 mole of oxygen molecular.​

Answer 1

Given:

Molecule= oxygen

moles = 0.5

Explanation:

Molecular mass is obtained by multiplying the atomic mass of each element with the corresponding number of atoms in the molecule

$O_{2}$ is a diatomic molecule.

The mass of an oxygen atom = $16 amu$

Now 1 amu = $1.66*10^{-24} g$

1 mole of oxygen has $10^{23}$ atoms of oxygen

mass of 1 mole of oxygen atoms = $10^{23}$ * $16$$amu$

                                                      = $16*1.66*10^{(-24+23)} g$

                                                      = $2.656 g$

An oxygen molecule has 2 oxygen atoms = 2 * mass of oxygen atom

                                                                      = $2 * 16 amu$

                                                                       = $32 amu$

Now mass of 1 mole of oxygen molecule = 2 * mass of 1 mole of oxygen atom

                                                                    = 2 *2.656 g

                                                                     = 5.312 g

So, Mass of 0.5 mole of oxygen molecule = 0.5 * mass of 1 mole of oxygen molecule

                                                                     = 0.5 * 5.312 g

                                                                     = 2.656 g

Mass of 0.5 mole of oxygen molecule = 2.656 g or 16 amu