What is the mass of a single astatine molecule,At₂?

Question

Quizplus · Accepted Answer

To calculate the mass of a single astatine molecule, we need to add up the atomic masses of all the atoms in the molecule. Using the periodic table, we can find that the atomic masses of one At, two S, and twelve B atoms are:

At: 210
S: 32.06 x 2 = 64.12
B: 10.81 x 12 = 129.72

Adding these up gives a total mass of:

210 + 64.12 + 129.72 = 403.84 g/mol

However, this is the mass of one mole of the molecule, not a single molecule. To get the mass of a single molecule, we need to divide by Avogadro's number:

403.84 g/mol / 6.022 x 10^23 molecules/mol = 6.70 x 10^-22 g/molecule

This is closest to option B, which is 6.97 x 10^-22 g/molecule.

What Is the Mass of a Single Astatine Molecule,At2

What Is the Mass of a Single Astatine Molecule,At₂