What is the mass, in grams, of 1.00 mole of argon gas?
The correct answer and explanation is:
The mass of 1.00 mole of argon gas is 39.95 grams.
Argon is a noble gas, and its molar mass can be found on the periodic table. The molar mass of an element refers to the mass of one mole of atoms of that element. The unit of molar mass is grams per mole (g/mol).
For argon, its molar mass is 39.95 g/mol. This means that one mole of argon atoms has a mass of 39.95 grams. To calculate the mass of 1.00 mole of any substance, you simply multiply the number of moles by the substance’s molar mass. In this case, for argon:
Mass = (1.00 mole) × (39.95 g/mol) = 39.95 grams
This calculation shows that 1 mole of argon gas will weigh 39.95 grams.
The reason the molar mass of argon is close to 40 g/mol is because the atomic mass of a single argon atom is around 39.95 atomic mass units (amu). The atomic mass unit is used to express the mass of individual atoms, but when dealing with macroscopic amounts of matter, such as 1 mole, the molar mass is used instead.
It is important to note that when working with gases, the molar mass of a substance is constant regardless of whether it is in the solid, liquid, or gaseous state. Therefore, 1 mole of argon gas, just like 1 mole of solid or liquid argon, has a mass of 39.95 grams.