Atoms and reactions

Which statement gives the numerical value of the Avogadro constant?

The number of helium atoms in $g8.0\text{ g}$ of helium gas, $He\text{He}$ .

The number of sulfate ions in $g49.0\text{ g}$ of sulfuric acid, $H2SO4\text{H}_2\text{SO}_4$ .

The number of chloride ions in $g55.5\text{ g}$ of calcium chloride, $CaCl2\text{CaCl}_2$ .

The number of electrons lost by $g48.6\text{ g}$ of magnesium when it reacts to form $Mg2+\text{Mg}^{2+}$ ions.

Atoms and reactions Questions

Which statement gives the numerical value of the Avogadro constant?

The number of helium atoms in $g8.0\text{ g}$ of helium gas, $He\text{He}$ .

The number of sulfate ions in $g49.0\text{ g}$ of sulfuric acid, $H2SO4\text{H}_2\text{SO}_4$ .

The number of chloride ions in $g55.5\text{ g}$ of calcium chloride, $CaCl2\text{CaCl}_2$ .

The number of electrons lost by $g48.6\text{ g}$ of magnesium when it reacts to form $Mg2+\text{Mg}^{2+}$ ions.