Question

1. zinc (zn) is used to form a corrosion-inhibiting surface on galvanized steel. determine the number of zn atoms in 2.50 mol of zn. (0.5 points) *

1.51 x 10²⁴ atoms
163.5 atoms
3.84 x 10²¹ atoms
4.15 x 10⁻²⁴ atoms

Explanation:

Step1: Recall Avogadro's number

Avogadro's number is \( 6.022 \times 10^{23} \) atoms/mol, which represents the number of atoms (or molecules, ions, etc.) in one mole of a substance.

Step2: Use the formula to calculate number of atoms

The formula to find the number of atoms (\( N \)) is \( N = n \times N_A \), where \( n \) is the number of moles and \( N_A \) is Avogadro's number.
Given \( n = 2.50 \) mol and \( N_A = 6.022 \times 10^{23} \) atoms/mol.
Substitute the values into the formula:
\( N = 2.50 \, \text{mol} \times 6.022 \times 10^{23} \, \text{atoms/mol} \)
\( N = 2.50 \times 6.022 \times 10^{23} \)
\( 2.50 \times 6.022 = 15.055 \)
So, \( N = 15.055 \times 10^{23} = 1.5055 \times 10^{24} \approx 1.51 \times 10^{24} \) atoms.

Answer:

A. \( 1.51 \times 10^{24} \) atoms