Final answer:
To find the molar mass of tetraethyllead, sum the molar masses of all carbon, hydrogen, and lead atoms in the compound, based on atomic weights in the periodic table. The molar mass is 323.44 g/mol, but since none of the options match perfectly, the closest from the given choices is (c) 325.42 g/mol.
Step-by-step explanation:
The student is asking how to calculate the molar mass of tetraethyllead given a sample mass of tetraethyllead. The molar mass of a substance is the mass of one mole of that substance. To find the molar mass of tetraethyllead, we need to understand its chemical formula, which is (C2H5)4Pb. The molar mass calculation for tetraethyllead involves summing the molar masses of all the atoms in the formula, using the periodic table for atomic weights:
- Carbon (C): 12.01 g/mol
- Hydrogen (H): 1.008 g/mol
- Lead (Pb): 207.2 g/mol, confirmed by the periodic table.
We can calculate the total molar mass as follows:
- For carbon: 8 (number of C atoms) x 12.01 g/mol = 96.08 g/mol
- For hydrogen: 20 (number of H atoms) x 1.008 g/mol = 20.16 g/mol
- For lead: 1 (number of Pb atoms) x 207.2 g/mol = 207.2 g/mol
The total molar mass of tetraethyllead is:
96.08 g/mol + 20.16 g/mol + 207.2 g/mol = 323.44 g/mol
Referring to the answer choices, none exactly match the calculated molar mass. However, since the question asks us to choose from given options, the closest choice to our calculated value would be option (c) 325.42 g/mol, noting that the actual calculated mass is 323.44 g/mol according to the chemical formula and atomic masses.