Question

8.3×10⁻³ mol c
express your answer using two significant figures.
n =
atoms
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part c
22.2 mol hg
express your answer using three significant figures.

Explanation:

Step1: Use Avogadro's number formula

$N = n \times N_A$, where $n=8.3 \times 10^{-3}\ \text{mol}$, $N_A=6.022 \times 10^{23}\ \text{atoms/mol}$

Step2: Calculate the number of atoms

$N = 8.3 \times 10^{-3} \times 6.022 \times 10^{23} \approx 5.0 \times 10^{21}$

Step3: Round to 2 significant figures

Result is $5.0 \times 10^{21}$ atoms

Answer:

$5.0 \times 10^{21}$ atoms