Question

What is the mass of two moles of oxygen gas (${O_2}$)?

Answer 1

Hint: The molecular weight of a material is equal to its mass in one mole. Water, for example, has a mean molecular weight of \[18.015\]atomic mass units , implying that one mole of water weighs \[18.015\] grams.

Complete step-by-step answer:
The chemical element with the letter O and atomic number 8 is oxygen. It is a member of the periodic table's chalcogen group, a highly reactive nonmetal, and an oxidising agent that forms oxides easily with many other elements and other compounds.

Oxygen and its compounds account for \[49.2\]percent of the Earth's surface by mass and about two-thirds of the human body. There are two primary strategies for obtaining oxygen gas. To distil liquid air is one method .Transferring clean, dry air through a zeolite, which absorbs nitrogen while leaving oxygen alone is the second method.

The molecular mass of oxygen is \[15.9994\]\[amu\]. So, one mole of oxygen is \[15.9994g\]. Since Oxygen is a diatomic particle represented as ${O_2}$which means that oxygen is bonded with itself. So, this means that \[15.9994 \times 2\]grams is the mass of one mole of oxygen gas. \[31.9988g\]is the mass of one mole of oxygen gas.

Thus, the mass of two moles of oxygen gas is \[31.9988 \times 2g\]which is \[63.9976g\].

Note: An element's molecular mass is known as the total of the masses of the elements contained in the molecule. The atomic mass of an element is multiplied by the number of atoms in the molecule, and then the masses of all the elements in the molecule are added.