7.88 * 10^24 atoms
Explanations:
The chemical formula for Salt is NaCl with a molar mass of 58.44g/mol
Determine the moles of NaCl
[tex]\begin{gathered} mole\text{ of NaCl}=\frac{Mass}{molar\text{ mass}} \\ mole\text{ of NaCl}=\frac{765}{58.44} \\ moles\text{ of NaCl}=13.09moles \end{gathered}[/tex]Determine the number of atoms of NaCl
According to the Avogadro's constant
1 mole = 6.02 * 10^23 atoms
13.09moles of NaCl will be equivalent to;
[tex]\begin{gathered} atoms\text{ of NaCl}=13.09\times6.02\times10^{23} \\ atoms\text{ of NaCl}=78.80\times10^{23} \\ atoms\text{ of NaCl}=7.88\times10^{24}atoms \end{gathered}[/tex]Hence there are 7.88 * 10^24 atoms in 765 grams of salt
