What mass of Al contains the same number of atoms as 3.0 g Pb?

Question

Quizplus · Accepted Answer

To solve this problem, we need to use the Avogadro's number, which is 6.022 x 10^23 atoms/mol.

First, we need to calculate the number of atoms in 3.0 g of Pb:

Number of atoms of Pb = (3.0 g) / (207.2 g/mol Pb) x (6.022 x 10^23 atoms/mol) 
Number of atoms of Pb = 8.67 x 10^21 atoms

Next, we need to determine how many grams of Al contain the same number of atoms:

Number of atoms of Al = 8.67 x 10^21 atoms 
Mass of Al = (8.67 x 10^21 atoms) x (1 mol Al / 6.022 x 10^23 atoms) x (26.98 g Al/mol) 
Mass of Al = 0.39 g

Therefore, the correct answer is D) 0.39 g.

What Mass of Al Contains the Same Number of Atoms