Answer :
The Mass of the oxygen as per the measurements made by chemist is 1.92 grams.
What is oxygen?
Oxygen is the name of the chemical element that has the atomic number 8 and the letter O. It is a very reactive nonmetal that is a member of the chalcogen group of the periodic table and an oxidizing agent that readily forms oxides with most elements as well as other compounds. The most prevalent element in the cosmos and on Earth, oxygen comes in third place after hydrogen and helium. At standard temperature and pressure, two of the element's atoms unite to form dioxygen, a colorless and odorless diatomic gas with the formula O 2. Diatomic oxygen gas currently makes up 20.95% of the Earth's atmosphere, but this percentage has varied greatly over a very long time. Nearly 50% of the oxygen in the crust of the Earth is present as oxides.
As given in the question, there is 0.060 moles of oxygen gas.
N = m / M
Where, N = number of moles, m = mass, M = molar mass of the atom
Given in question, N = 0.060
and since, it is in oxygen gas form it will be dioxygen so, Molar mass of dioxygen is 32 u
Putting the values in formula:
0.060 = m / 32
m = 0.060(32)
Mass (m) = 1.92 grams
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