Calculate the molar mass of propane, C3H8.
Select one:
44.1 g/mol
36.0 g/mol
24.0 g/mol
60.1 g/mol
26.0 g/mol
The correct answer and explanation is :
The correct answer is: 44.1 g/mol
Explanation:
To calculate the molar mass of a compound, we need to sum the atomic masses of all atoms in the molecule. Let’s break it down for propane (C₃H₈):
1. Identify the Elements in Propane (C₃H₈):
- Carbon (C)
- Hydrogen (H)
2. Determine the Number of Each Atom:
- 3 Carbon atoms
- 8 Hydrogen atoms
3. Use the Periodic Table for Atomic Masses:
- Atomic mass of Carbon (C) = 12.01 g/mol
- Atomic mass of Hydrogen (H) = 1.008 g/mol
4. Calculate Total Mass:
- Carbon: 3 × 12.01 = 36.03 g/mol
- Hydrogen: 8 × 1.008 = 8.064 g/mol
5. Add Them Together:
- Total molar mass = 36.03 + 8.064 = 44.094 g/mol
Rounded to one decimal place, the molar mass of propane is:
✅ 44.1 g/mol
Why This Matters:
Molar mass is a critical concept in chemistry because it allows scientists and students to convert between grams and moles, which are essential for calculations in stoichiometry, gas laws, and reaction yields.
For example, if you were to combust propane for energy, knowing the molar mass would help you determine how much CO₂ is produced per mole or per gram of propane used.
Understanding how to calculate molar mass also reinforces a basic skill in interpreting chemical formulas and using the periodic table — fundamental for all chemistry students and professionals.
In short, the correct molar mass of propane is 44.1 g/mol, and it serves as the bridge between microscopic particles and macroscopic measurements.
