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Hydrogen gas (H2) Molar mass and Molecular weight

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%

 

The molar mass and molecular weight of Hydrogen gas (H2)

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.

atomic weight of each element in H2

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:

Formula to calculate Molar mass

For Hydrogen gas (H2):

Molar mass = Σ [(Atomic weight of Hydrogen (H) x Number of H-atoms)] in 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:
  • Determine the atomic weight of Hydrogen i.e., 1.00797 g/mol.
  • Find the mass of Hydrogen (H) in H2 by multiplying the atomic weight of an H-atom with the total number of H-atoms in H2 i.e., 2.

∴ 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%
∴ Mass percent of Hydrogen in H2 = (2.0159/2.0159) × 100% = 100.00 %

Result: H2 contains 100.00 % of Hydrogen as per its chemical composition.

Mass percent Composition of H in Hydrogen gas (H2)

 

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:
• There’s 2 H-atoms.
• Total atoms in H2 = 2 = 2

The atomic percentage composition of elements in the compound is:

Atomic percentage of Hydrogen (H) in H2:
= (2/2) * 100
= 100.00%

atomic percent composition in Hydrogen gas (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.

 

What is the molar mass and molecular weight of Hydrogen gas (H2)?

H2 is composed of .
  • The atomic weight of Hydrogen is 1.00797 g/mol.

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.

How to calculate the molar mass of Hydrogen gas (H2)

 

About the author

Vishal Goyal author of topblogtenz.com

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/

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