Question

Calculate the number of lithium (Li) atoms (NₙLi) present in 9.2 moles of lithium.

A) 3.01 × 10²4 atoms
B) 5.54 × 10²3 atoms
C) 2.21 × 10²3 atoms
D) 1.84 × 10²4 atoms

Answer 1

To find the number of lithium atoms in 9.2 moles of lithium, multiply the moles by Avogadro's number, which results in 5.54 × 10²´ atoms. Option B

Step-by-step explanation:

To calculate the number of lithium (Li) atoms present in 9.2 moles of lithium, you can use Avogadro's number, which is 6.022 × 10²³ atoms per mole. Using the formula to find the number of atoms:

Multiply the number of moles by Avogadro's number.

Apply this calculation to the problem at hand.

Nₙᵢ = moles × Avogadro's number = 9.2 moles × 6.022 × 10²³ atoms/mol

Now perform the multiplication to find the number of atoms:

Nₙᵢ = 9.2 × 6.022 × 10²³ atoms

= 55.4024 × 10²³ atoms

= 5.54 × 10²´ atoms (when rounded to three significant figures)

Therefore, there are 5.54 × 10²´ lithium atoms in 9.2 moles, which corresponds to option B.