5. The number of moles of molecules in a 12.0-gram sample of Cl2 is A) 12.0 moles

Considering the definition of molar mass, the number of moles of molecules in a 12 grams sample of Cl₂ is = 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:

In this case, you have 12 grams sample of Cl₂, whose molar mass is 71 .

So, the number of moles can be calculated as:

Solving:

number of moles= 0.169 moles

Finally, the number of moles of molecules in a 12 grams sample of Cl₂ is = 0.169 moles.

Learn more about molar mass and number of moles:

mole

Explanation:

Given parameters:

Mass  = 12g

Molecule  = Cl₂

Unknown:

Number of moles of molecules  = ?

Solution:

To solve this problem, we use the expression below:

   Number of moles  =  

 molar mass of  Cl₂  = 2 (35.5)  = 71g/mol

 Number of moles  = mole

It is malleable and ductile.

Explanation:

That section of the periodic table is home to metal elements. So they are not dull or brittle, they are not liquid at room temperature, and they are very good conductors of electricity (though some are better than others). But they are malleable and ductile.