Question

What is the number of atoms in 46g of sodium (Na = 23)?

a) 2 atoms
b) 6.02 × 10²³ atoms
c) 1 mole of atoms
d) 23 atoms

Answer 1

In 46g of sodium, there are 6.02 × 10²³ atoms.

Step-by-step explanation:

The number of atoms in a sample can be calculated using Avogadro's number, which states that there are 6.02 × 10²³ particles, such as atoms or molecules, in one mole of a substance. To calculate the number of atoms in 46g of sodium (Na), we need to first determine the number of moles of sodium using its molar mass. The molar mass of sodium is 23g/mol, so the number of moles can be calculated as:

46g Na * (1 mol Na / 23g Na) = 2 mol Na

Since there are 6.02 × 10²³ particles in one mole, the number of atoms in 2 moles of sodium is:

2 mol Na * (6.02 × 10²³ atoms/mol) = 12.04 × 10²³ atoms

Therefore, the correct answer is b) 6.02 × 10²³ atoms.