The molar mass and molecular weight of Oxygen gas (O2) is 31.9988 g/mol.
The composition of the O2 formula is as follows:
| Element | Symbol | Atomic Weight | Atoms | Total Atomic Weight | Mass Percent |
|---|---|---|---|---|---|
| Oxygen | O | 15.9994 g/mol | 2 | 31.9988 g/mol | 100.0000% |
How to find the molar mass of Oxygen gas (O2)?
The molar mass and molecular weight of Oxygen gas (O2) can be calculated in 4 steps.
Step I: Identify the different elemental atoms present in the O2 compound.
The given compound is O2. It comprises atoms from 1 different elements i.e., and Oxygen (O).
Step II: Find the atomic weight of each element in the O2.
Here is the list of atomic weights for all elements, let’s check the and Oxygen (O) atom’s atomic weight.
• The atomic weight of Oxygen (O) is 15.9994 g/mol.
Step III: Determine the number of atoms of each element present in the O2 compound.
As per the chemical formula, O2, It is made up of and 2 Oxygen atoms.
| Element | Number of Atoms |
|---|---|
| O (Oxygen) | 2 |
Step IV: Calculate the molar mass of the Oxygen gas (O2) compound by applying the formula:
For Oxygen gas (O2):
Substituting into the above formula, the values determined in steps II and III:
Molar mass of O2 = [(15.9994 x 2)]
Molar mass of O2 = 31.9988 = 31.9988 g/mol
Result: The molecular weight and molar mass of Oxygen gas (O2) is 31.9988 g/mol.
FAQs
What is the mass percent composition of Oxygen (O) in Oxygen gas (O2)? |
To find the mass percent of Oxygen in O2, follow the steps given below:
∴ Mass of Oxygen in O2 = 15.9994 x 2 = 31.9988 g/mol. Mass Percent Composition (%) Formula = (Mass of Element in the Compound/Molar Mass of the Compound) x 100 ∴ Mass percent of Oxygen in O2 = (Mass of Oxygen in O2/Molar mass of O2) × 100% Result: O2 contains 100.00 % of Oxygen as per its chemical composition.
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What is the atomic percentage composition of elements in Oxygen gas (O2)? |
| Atomic percentage composition formula (%) = Number of atoms of a particular element in a compound/Total number of atoms in that compound
For O2: The atomic percentage composition of elements in the compound is: Atomic percentage of Oxygen (O) in O2:
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How many grams of Oxygen are present in 1 mole of O2? |
| There are 2 O-atoms in a O2 molecule. • Atomic weight of a O-atom = 15.9994 g/mol ∴ Total mass of Oxygen in 1 mole of O2 = 2 x 15.9994 = 32.00 g. Therefore there are 32.00 grams of Oxygen in 1 mole of O2. |
What is the mass of 2 mol of O2? |
| The molecular mass of O2 is 31.9988 g/mol. This means 31.9988 grams of O2 are present per mole. Therefore, we can find the mass of O2 in 2 moles as follows: ∴ Moles = Mass/Molar Mass ∴ Mass of O2 = Moles x Molar mass ∴ Mass of O2 = 2 x 31.9988 = 64.00 g Thus, the mass of 2 mol of O2 is 64.00 g. |
If you have 22.3992 grams of O2, how many moles do you have? |
| ∴ Moles = Mass/Molar mass ∴ Moles of O2 = 22.3992/31.9988 = 0.7000 Thus, there are 0.7000 moles of O2 in its 22.3992 grams. |
What is the mass in kg of 5.33 x 1025 molecules of O2? |
| 1 mole of a substance contains Avogadro number of particles i.e., 6.02 x 1023. Therefore, the number of moles in 5.33 x 1025 molecules of O2 are: ∴ Moles of O2 = 5.33 x 1025/6.02 x 1023 = 88.6
Now that we have its number of moles, so, we can use the molar mass of O2 (31.9988 g/mol) to find its mass as shown below. ∴ Mass of O2 = Moles x Molar mass
∴ Mass of O2 = 88.6 x 31.9988 = 2834.78 g
Converting mass from grams (g) to kilograms (kg) gives us: ∴ Mass of O2 = 2834.78/1000 = 2.83 kg
The mass of 5.33 x 1025 molecules of O2 is 2.83 kg.
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What is the molar mass and molecular weight of Oxygen gas (O2)? |
O2 is composed of .
To find the molecular mass of O2, one multiplies the atomic weight of each element by its number of atoms in the molecule and then sums the results. ∴ For O2, it’s (2 x 15.9994).
Therefore, the molar mass of Oxygen gas (O2) is 31.9988 g/mol.
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About the author
Vishal Goyal is the founder of Topblogtenz, a comprehensive resource for students seeking guidance and support in their chemistry studies. He holds a degree in B.Tech (Chemical Engineering) and has four years of experience as a chemistry tutor. The team at Topblogtenz includes experts like experienced researchers, professors, and educators, with the goal of making complex subjects like chemistry accessible and understandable for all. A passion for sharing knowledge and a love for chemistry and science drives the team behind the website. Let's connect through LinkedIn: https://www.linkedin.com/in/vishal-goyal-2926a122b/