Question

What is the mass of $0.35$ moles of oxygen gas molecules?

Answer 1

Hint : Oxygen is a chemical element with an atomic number $8$ and the symbol $O$. It is a highly reactive nonmetal and an oxidizing agent that readily forms oxides with most elements and other compounds. It belongs to the chalcogen group in the periodic table.

Complete Step By Step Answer:
The total mass of one mole of a substance is known as the molar mass of that substance.
A mole is known in chemistry as the sum of a substance that contains exactly $6.022214076 \times {10^{23}}$ of the substance's "elementary entities." Atoms, molecules, monatomic/polyatomic ions, and other particles such as electrons are examples of elementary entities that can be expressed in moles. The Avogadro constant is the number $6.022214076 \times {10^{23}}$ that the symbol ${N_A}$ frequently denotes.
To calculate the mass, we have to use the formula.
That is $n = \dfrac{m}{M}$ .
Where $M$ is the molar mass, $m$ is the mass in grams, and $n$ is the number of moles.
Rearrange the formula to get the mass of the molecule.
That is $m = nM$ .
As given, there are $0.35$ moles of oxygen gas molecules.
We know that the molar mass of an oxygen atom is $16$ grams. Since we want oxygen molecule; there is two oxygen atoms. That is $2 \times 16g$ .
The molar mass of ${O_2}$ is $32$ g/mol.
Therefore, $m = 0.35 \times 32 = 11g$ .
So, the answer is 11g.

Additional Information:
Remember the formula $n = \dfrac{m}{M}$ .
Where $M$ is the molar mass, $m$ is the mass in grams, and $n$ is the number of moles.
Also, keep in mind that the molar mass of an oxygen atom is $16$ grams.

Note :
Photosynthesis uses the energy of sunlight to create oxygen from water and carbon dioxide, replenishes oxygen in the atmosphere continuously. Oxygen is too chemically reactive to remain as a free element in the air unless living organisms' photosynthetic activity constantly replenishes it.