Question

1. how many atoms of mercury are in 65.0 grams of it?

Explanation:

Step1: Find molar mass of mercury

The molar mass of mercury (Hg) is approximately 200.59 g/mol.

Step2: Calculate number of moles

Use the formula $n=\frac{m}{M}$, where $m = 65.0$ g and $M=200.59$ g/mol. So $n=\frac{65.0}{200.59}\approx0.324$ mol.

Step3: Calculate number of atoms

Use Avogadro's number $N_A = 6.022\times 10^{23}$ atoms/mol. The number of atoms $N=n\times N_A$. So $N = 0.324\times6.022\times 10^{23}\approx1.95\times 10^{23}$ atoms.

Answer:

$1.95\times 10^{23}$ atoms