Considering the definition of molar mass, the number of moles of molecules in a 12 grams sample of Cl₂ is [tex]\frac{12 g}{71 \frac{g}{mole} }[/tex]= 0.169 moles.
Molar mass is the mass of one mole of a substance, which can be an element or a compound.
In other words, molar mass is the amount of mass that a substance contains in one mole.
Therefore, knowing the molar mass, the number of moles in a container can be calculated using the expression:
[tex]number of moles=\frac{mass}{molar mass}[/tex]
In this case, you have 12 grams sample of Cl₂, whose molar mass is 71 [tex]\frac{g}{mole}[/tex].
So, the number of moles can be calculated as:
[tex]number of moles=\frac{12 g}{71 \frac{g}{mole} }[/tex]
Solving:
number of moles= 0.169 moles
Finally, the number of moles of molecules in a 12 grams sample of Cl₂ is [tex]\frac{12 g}{71 \frac{g}{mole} }[/tex]= 0.169 moles.
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