What is the molar mass of PBCO3
The Correct Answer and Explanation is :
The molar mass of the compound PbCO₃ (lead(II) carbonate) can be calculated by summing the molar masses of each constituent element in the formula:
- Lead (Pb): The atomic mass of lead is approximately 207.2 g/mol.
- Carbon (C): The atomic mass of carbon is approximately 12.0 g/mol.
- Oxygen (O): The atomic mass of oxygen is approximately 16.0 g/mol.
Since there are three oxygen atoms in PbCO₃, we multiply the atomic mass of oxygen by three:
- Total contribution from oxygen = (3 \times 16.0 \, \text{g/mol} = 48.0 \, \text{g/mol})
Now we can sum the molar masses:
[
\text{Molar mass of PbCO₃} = \text{Molar mass of Pb} + \text{Molar mass of C} + 3 \times \text{Molar mass of O}
]
Substituting the values we found:
[
\text{Molar mass of PbCO₃} = 207.2 \, \text{g/mol} + 12.0 \, \text{g/mol} + 48.0 \, \text{g/mol}
]
[
\text{Molar mass of PbCO₃} = 267.2 \, \text{g/mol}
]
Explanation of Molar Mass Calculation
The molar mass is a critical concept in chemistry, representing the mass of one mole of a substance, expressed in grams per mole (g/mol). It is essential for stoichiometric calculations in chemical reactions, allowing chemists to convert between the mass of a substance and the number of moles, which reflects the quantity of particles (atoms, molecules, or ions).
When determining the molar mass, it is vital to use accurate atomic masses, typically found on the periodic table. The process involves breaking down the chemical formula into its elemental components, calculating the contribution of each element based on its quantity in the formula, and summing these contributions to arrive at the total molar mass.
For PbCO₃, this calculation reveals the compound’s significance in various applications, such as in ceramics, glass production, and as a pigment. Understanding its molar mass can aid in various laboratory practices, including dilution calculations and reaction yield predictions.