The molar mass and molecular weight of Hydrogen gas (H2) is 2.0159 g/mol.
The composition of the H2 formula is as follows:
| Element | Symbol | Atomic Weight | Atoms | Total Atomic Weight | Mass Percent |
|---|---|---|---|---|---|
| Hydrogen | H | 1.00797 g/mol | 2 | 2.0159 g/mol | 100.0000% |
How to find the molar mass of Hydrogen gas (H2)?
The molar mass and molecular weight of Hydrogen gas (H2) can be calculated in 4 steps.
Step I: Identify the different elemental atoms present in the H2 compound.
The given compound is H2. It comprises atoms from 1 different elements i.e., and Hydrogen (H).
Step II: Find the atomic weight of each element in the H2.
Here is the list of atomic weights for all elements, let’s check the and Hydrogen (H) atom’s atomic weight.
• The atomic weight of Hydrogen (H) is 1.00797 g/mol.
Step III: Determine the number of atoms of each element present in the H2 compound.
As per the chemical formula, H2, It is made up of and 2 Hydrogen atoms.
| Element | Number of Atoms |
|---|---|
| H (Hydrogen) | 2 |
Step IV: Calculate the molar mass of the Hydrogen gas (H2) compound by applying the formula:
For Hydrogen gas (H2):
Substituting into the above formula, the values determined in steps II and III:
Molar mass of H2 = [(1.00797 x 2)]
Molar mass of H2 = 2.01594 = 2.0159 g/mol
Result: The molecular weight and molar mass of Hydrogen gas (H2) is 2.0159 g/mol.
FAQs
What is the mass percent composition of Hydrogen (H) in Hydrogen gas (H2)? |
To find the mass percent of Hydrogen in H2, follow the steps given below:
∴ Mass of Hydrogen in H2 = 1.00797 x 2 = 2.0159 g/mol. Mass Percent Composition (%) Formula = (Mass of Element in the Compound/Molar Mass of the Compound) x 100 ∴ Mass percent of Hydrogen in H2 = (Mass of Hydrogen in H2/Molar mass of H2) × 100% Result: H2 contains 100.00 % of Hydrogen as per its chemical composition.
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What is the atomic percentage composition of elements in Hydrogen gas (H2)? |
| Atomic percentage composition formula (%) = Number of atoms of a particular element in a compound/Total number of atoms in that compound
For H2: The atomic percentage composition of elements in the compound is: Atomic percentage of Hydrogen (H) in H2:
|
How many grams of Hydrogen are present in 1 mole of H2? |
| There are 2 H-atoms in a H2 molecule. • Atomic weight of a H-atom = 1.00797 g/mol ∴ Total mass of Hydrogen in 1 mole of H2 = 2 x 1.00797 = 2.02 g. Therefore there are 2.02 grams of Hydrogen in 1 mole of H2. |
What is the mass of 2 mol of H2? |
| The molecular mass of H2 is 2.0159 g/mol. This means 2.0159 grams of H2 are present per mole. Therefore, we can find the mass of H2 in 2 moles as follows: ∴ Moles = Mass/Molar Mass ∴ Mass of H2 = Moles x Molar mass ∴ Mass of H2 = 2 x 2.0159 = 4.03 g Thus, the mass of 2 mol of H2 is 4.03 g. |
If you have 1.4112 grams of H2, how many moles do you have? |
| ∴ Moles = Mass/Molar mass ∴ Moles of H2 = 1.4112/2.0159 = 0.7000 Thus, there are 0.7000 moles of H2 in its 1.4112 grams. |
What is the mass in kg of 0.34 x 1025 molecules of H2? |
| 1 mole of a substance contains Avogadro number of particles i.e., 6.02 x 1023. Therefore, the number of moles in 0.34 x 1025 molecules of H2 are: ∴ Moles of H2 = 0.34 x 1025/6.02 x 1023 = 5.6
Now that we have its number of moles, so, we can use the molar mass of H2 (2.0159 g/mol) to find its mass as shown below. ∴ Mass of H2 = Moles x Molar mass
∴ Mass of H2 = 5.6 x 2.0159 = 11.25 g
Converting mass from grams (g) to kilograms (kg) gives us: ∴ Mass of H2 = 11.25/1000 = 0.01 kg
The mass of 0.34 x 1025 molecules of H2 is 0.01 kg.
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What is the molar mass and molecular weight of Hydrogen gas (H2)? |
H2 is composed of .
To find the molecular mass of H2, one multiplies the atomic weight of each element by its number of atoms in the molecule and then sums the results. ∴ For H2, it’s (2 x 1.0080).
Therefore, the molar mass of Hydrogen gas (H2) is 2.0159 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/