The molar mass and molecular weight of Hydrochloric acid (HCl) is 36.4610 g/mol.
The composition of the HCl formula is as follows:
| Element | Symbol | Atomic Weight | Atoms | Total Atomic Weight | Mass Percent |
|---|---|---|---|---|---|
| Chlorine | Cl | 35.453 g/mol | 1 | 35.4530 g/mol | 97.2355% |
| Hydrogen | H | 1.00797 g/mol | 1 | 1.0080 g/mol | 2.7645% |
How to find the molar mass of Hydrochloric acid (HCl)?
The molar mass and molecular weight of Hydrochloric acid (HCl) can be calculated in 4 steps.
Step I: Identify the different elemental atoms present in the HCl compound.
The given compound is HCl. It comprises atoms from 2 different elements i.e., Chlorine (Cl) and Hydrogen (H).
Step II: Find the atomic weight of each element in the HCl.
Here is the list of atomic weights for all elements, let’s check the Chlorine (Cl) and Hydrogen (H) atom’s atomic weight.
• The atomic weight of Chlorine (Cl) is 35.453 g/mol.
• The atomic weight of Hydrogen (H) is 1.00797 g/mol.
Step III: Determine the number of atoms of each element present in the HCl compound.
As per the chemical formula, HCl, It is made up of 1 Chlorine atom and 1 Hydrogen atom.
| Element | Number of Atoms |
|---|---|
| Cl (Chlorine) | 1 |
| H (Hydrogen) | 1 |
Step IV: Calculate the molar mass of the Hydrochloric acid (HCl) compound by applying the formula:
For Hydrochloric acid (HCl):
Substituting into the above formula, the values determined in steps II and III:
Molar mass of HCl = [(35.453 x 1) + (1.00797 x 1)]
Molar mass of HCl = 35.453 + 1.00797 = 36.4610 g/mol
Result: The molecular weight and molar mass of Hydrochloric acid (HCl) is 36.4610 g/mol.
FAQs
What is the mass percent composition of Chlorine (Cl) in Hydrochloric acid (HCl)? |
To find the mass percent of Chlorine in HCl, follow the steps given below:
∴ Mass of Chlorine in HCl = 35.453 x 1 = 35.4530 g/mol. Mass Percent Composition (%) Formula = (Mass of Element in the Compound/Molar Mass of the Compound) x 100 ∴ Mass percent of Chlorine in HCl = (Mass of Chlorine in HCl/Molar mass of HCl) × 100% Result: HCl contains 97.24 % of Chlorine as per its chemical composition.
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What is the mass percent composition of Hydrogen (H) in Hydrochloric acid (HCl)? |
To find the mass percent of Hydrogen in HCl, follow the steps given below:
∴ Mass of Hydrogen in HCl = 1.00797 x 1 = 1.0080 g/mol. Mass Percent Composition (%) Formula = (Mass of Element in the Compound/Molar Mass of the Compound) x 100 ∴ Mass percent of Hydrogen in HCl = (Mass of Hydrogen in HCl/Molar mass of HCl) × 100% Result: HCl contains 2.76 % of Hydrogen as per its chemical composition.
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What is the atomic percentage composition of elements in Hydrochloric acid (HCl)? |
| Atomic percentage composition formula (%) = Number of atoms of a particular element in a compound/Total number of atoms in that compound
For HCl: The atomic percentage composition of elements in the compound is: Atomic percentage of Chlorine (Cl) in HCl: Atomic percentage of Hydrogen (H) in HCl:
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How many grams of Chlorine are present in 1 mole of HCl? |
| There are 1 Cl-atoms in a HCl molecule. • Atomic weight of a Cl-atom = 35.453 g/mol ∴ Total mass of Chlorine in 1 mole of HCl = 1 x 35.453 = 35.45 g. Therefore there are 35.45 grams of Chlorine in 1 mole of HCl. |
What is the mass of 2 mol of HCl? |
| The molecular mass of HCl is 36.4610 g/mol. This means 36.4610 grams of HCl are present per mole. Therefore, we can find the mass of HCl in 2 moles as follows: ∴ Moles = Mass/Molar Mass ∴ Mass of HCl = Moles x Molar mass ∴ Mass of HCl = 2 x 36.4610 = 72.92 g Thus, the mass of 2 mol of HCl is 72.92 g. |
If you have 42.7452 grams of HCl, how many moles do you have? |
| ∴ Moles = Mass/Molar mass ∴ Moles of HCl = 42.7452/36.4610 = 1.1724 Thus, there are 1.1724 moles of HCl in its 42.7452 grams. |
What is the mass in kg of 6.08 x 1025 molecules of HCl? |
| 1 mole of a substance contains Avogadro number of particles i.e., 6.02 x 1023. Therefore, the number of moles in 6.08 x 1025 molecules of HCl are: ∴ Moles of HCl = 6.08 x 1025/6.02 x 1023 = 100.9
Now that we have its number of moles, so, we can use the molar mass of HCl (36.4610 g/mol) to find its mass as shown below. ∴ Mass of HCl = Moles x Molar mass
∴ Mass of HCl = 100.9 x 36.4610 = 3680.52 g
Converting mass from grams (g) to kilograms (kg) gives us: ∴ Mass of HCl = 3680.52/1000 = 3.68 kg
The mass of 6.08 x 1025 molecules of HCl is 3.68 kg.
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What is the molar mass and molecular weight of Hydrochloric acid (HCl)? |
HCl is composed of 1 Chlorine (Cl), and 1 Hydrogen (H) atom.
To find the molecular mass of HCl, one multiplies the atomic weight of each element by its number of atoms in the molecule and then sums the results. ∴ For HCl, it’s (1 x 35.4530) + (1 x 1.0080).
Therefore, the molar mass of Hydrochloric acid (HCl) is 36.4610 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/