The molar mass and molecular weight of Phosphorus Pentachloride (PCl5) is 208.2388 g/mol.
The composition of the PCl5 formula is as follows:
| Element | Symbol | Atomic Weight | Atoms | Total Atomic Weight | Mass Percent |
|---|---|---|---|---|---|
| Chlorine | Cl | 35.453 g/mol | 5 | 177.2650 g/mol | 85.1258% |
| Phosphorus | P | 30.97376 g/mol | 1 | 30.9738 g/mol | 14.8742% |
How to find the molar mass of Phosphorus Pentachloride (PCl5)?
The molar mass and molecular weight of Phosphorus Pentachloride (PCl5) can be calculated in 4 steps.
Step I: Identify the different elemental atoms present in the PCl5 compound.
The given compound is PCl5. It comprises atoms from 2 different elements i.e., Chlorine (Cl) and Phosphorus (P).
Step II: Find the atomic weight of each element in the PCl5.
Here is the list of atomic weights for all elements, let’s check the Chlorine (Cl) and Phosphorus (P) atom’s atomic weight.
• The atomic weight of Chlorine (Cl) is 35.453 g/mol.
• The atomic weight of Phosphorus (P) is 30.97376 g/mol.
Step III: Determine the number of atoms of each element present in the PCl5 compound.
As per the chemical formula, PCl5, It is made up of 5 Chlorine atoms and 1 Phosphorus atom.
| Element | Number of Atoms |
|---|---|
| Cl (Chlorine) | 5 |
| P (Phosphorus) | 1 |
Step IV: Calculate the molar mass of the Phosphorus Pentachloride (PCl5) compound by applying the formula:
For Phosphorus Pentachloride (PCl5):
Substituting into the above formula, the values determined in steps II and III:
Molar mass of PCl5 = [(35.453 x 5) + (30.97376 x 1)]
Molar mass of PCl5 = 177.2650 + 30.97376 = 208.2388 g/mol
Result: The molecular weight and molar mass of Phosphorus Pentachloride (PCl5) is 208.2388 g/mol.
FAQs
What is the mass percent composition of Chlorine (Cl) in Phosphorus Pentachloride (PCl5)? |
To find the mass percent of Chlorine in PCl5, follow the steps given below:
∴ Mass of Chlorine in PCl5 = 35.453 x 5 = 177.2650 g/mol. Mass Percent Composition (%) Formula = (Mass of Element in the Compound/Molar Mass of the Compound) x 100 ∴ Mass percent of Chlorine in PCl5 = (Mass of Chlorine in PCl5/Molar mass of PCl5) × 100% Result: PCl5 contains 85.13 % of Chlorine as per its chemical composition.
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What is the mass percent composition of Phosphorus (P) in Phosphorus Pentachloride (PCl5)? |
To find the mass percent of Phosphorus in PCl5, follow the steps given below:
∴ Mass of Phosphorus in PCl5 = 30.97376 x 1 = 30.9738 g/mol. Mass Percent Composition (%) Formula = (Mass of Element in the Compound/Molar Mass of the Compound) x 100 ∴ Mass percent of Phosphorus in PCl5 = (Mass of Phosphorus in PCl5/Molar mass of PCl5) × 100% Result: PCl5 contains 14.87 % of Phosphorus as per its chemical composition.
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What is the atomic percentage composition of elements in Phosphorus Pentachloride (PCl5)? |
| Atomic percentage composition formula (%) = Number of atoms of a particular element in a compound/Total number of atoms in that compound
For PCl5: The atomic percentage composition of elements in the compound is: Atomic percentage of Chlorine (Cl) in PCl5: Atomic percentage of Phosphorus (P) in PCl5:
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How many grams of Chlorine are present in 1 mole of PCl5? |
| There are 5 Cl-atoms in a PCl5 molecule. • Atomic weight of a Cl-atom = 35.453 g/mol ∴ Total mass of Chlorine in 1 mole of PCl5 = 5 x 35.453 = 177.27 g. Therefore there are 177.27 grams of Chlorine in 1 mole of PCl5. |
What is the mass of 6 mol of PCl5? |
| The molecular mass of PCl5 is 208.2388 g/mol. This means 208.2388 grams of PCl5 are present per mole. Therefore, we can find the mass of PCl5 in 6 moles as follows: ∴ Moles = Mass/Molar Mass ∴ Mass of PCl5 = Moles x Molar mass ∴ Mass of PCl5 = 6 x 208.2388 = 1249.43 g Thus, the mass of 6 mol of PCl5 is 1249.43 g. |
If you have 77.1008 grams of PCl5, how many moles do you have? |
| ∴ Moles = Mass/Molar mass ∴ Moles of PCl5 = 77.1008/208.2388 = 0.3703 Thus, there are 0.3703 moles of PCl5 in its 77.1008 grams. |
What is the mass in kg of 34.71 x 1025 molecules of PCl5? |
| 1 mole of a substance contains Avogadro number of particles i.e., 6.02 x 1023. Therefore, the number of moles in 34.71 x 1025 molecules of PCl5 are: ∴ Moles of PCl5 = 34.71 x 1025/6.02 x 1023 = 576.5
Now that we have its number of moles, so, we can use the molar mass of PCl5 (208.2388 g/mol) to find its mass as shown below. ∴ Mass of PCl5 = Moles x Molar mass
∴ Mass of PCl5 = 576.5 x 208.2388 = 120053.66 g
Converting mass from grams (g) to kilograms (kg) gives us: ∴ Mass of PCl5 = 120053.66/1000 = 120.05 kg
The mass of 34.71 x 1025 molecules of PCl5 is 120.05 kg.
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What is the molar mass and molecular weight of Phosphorus Pentachloride (PCl5)? |
PCl5 is composed of 5 Chlorine (Cl), and 1 Phosphorus (P) atom.
To find the molecular mass of PCl5, one multiplies the atomic weight of each element by its number of atoms in the molecule and then sums the results. ∴ For PCl5, it’s (5 x 35.4530) + (1 x 30.9738).
Therefore, the molar mass of Phosphorus Pentachloride (PCl5) is 208.2388 g/mol.
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