which best compares 1 mol of sodium chloride to 1 mol of aluminum chloride?\nboth have the same molar…

which best compares 1 mol of sodium chloride to 1 mol of aluminum chloride?\nboth have the same molar mass.\nboth have the same number of ions.\nboth are made up of 6.02×10²³ molecules.\nboth are made up of 6.02×10²³ formula units.

which best compares 1 mol of sodium chloride to 1 mol of aluminum chloride?\nboth have the same molar mass.\nboth have the same number of ions.\nboth are made up of 6.02×10²³ molecules.\nboth are made up of 6.02×10²³ formula units.

Answer

Answer:

D. Both are made up of $6.02\times 10^{23}$ formula units.

Explanation:

Step1: Recall molar - mass concept

Sodium chloride ($NaCl$) molar mass: $22.99 + 35.45=58.44\ g/mol$, aluminum chloride ($AlCl_3$) molar mass: $26.98+3\times35.45 = 133.33\ g/mol$. So they don't have same molar mass.

Step2: Analyze ion - number

$1\ mol\ NaCl$ dissociates into $1\ mol\ Na^+$ and $1\ mol\ Cl^-$, total $2\ mol$ of ions. $1\ mol\ AlCl_3$ dissociates into $1\ mol\ Al^{3 + }$ and $3\ mol\ Cl^-$, total $4\ mol$ of ions. So they don't have same number of ions.

Step3: Understand molecular/ionic nature

$NaCl$ and $AlCl_3$ are ionic compounds, not molecular compounds, so we don't use the term'molecules' for them.

Step4: Recall Avogadro's number

One mole of any substance contains $6.02\times 10^{23}$ formula units. For ionic compounds like $NaCl$ and $AlCl_3$, we use the term formula units. So $1\ mol$ of $NaCl$ and $1\ mol$ of $AlCl_3$ both contain $6.02\times 10^{23}$ formula units.