Question

6.21×10²³ k atoms
express your answer using three significant figures.
ν = mol

Explanation:

Step1: Recall Avogadro's number

Avogadro's number is \( 6.022\times 10^{23} \) atoms/mol. To find moles, use the formula \( n=\frac{N}{N_A} \), where \( N \) is number of atoms, \( N_A \) is Avogadro's number.

Step2: Substitute values

\( N = 6.21\times 10^{23} \) atoms, \( N_A=6.022\times 10^{23} \) atoms/mol. So \( n=\frac{6.21\times 10^{23}}{6.022\times 10^{23}} \).

Step3: Calculate and round

Simplify: \( \frac{6.21}{6.022}\approx 1.031 \), round to three significant figures: \( 1.03 \).

Answer:

\( 1.03 \)