Question

How many moles of chlorine are in 100g chlorine (Cl2)?

Answer 1

Considering the definition of molar mass, the correct answer is option D: 1.41 moles are in 100 grams of Cl₂.

Definition of molar mass

The given molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

Molar mass of Cl₂

In this case, you know the molar mass of the elements is:

Cl: 35.45 g/mole

So, the molar mass of the compound Cl₂ is calculated as:

Cl₂= 2× 35.45 g/mole

Solving:

Cl₂= 70.9 g/mole

Amount of moles of 100 grams of Cl₂

Next, you can apply the following rule of three: if by definition of molar mass 70.9 grams of the compound are contained in 1 mole, 100 grams are contained in how many moles?

$amount of moles=\frac{100 gramsx1 mole}{70.9 grams}$

amount of moles= 1.41 moles

In summary, the correct answer is option D: 1.41 moles are in 100 grams of Cl₂.

Learn more about molar mass:

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