Calculate how many moles in 90.4 grams Cl2

Question

90.4 g Cl2 x ?/?=

Answer 1

First we need to determine the mass of one mole of Cl2 (molar mass). Cl2 is made up of 2 chlorine atoms. Each chlorine atom has a molar mass of 35.5 g/mol (from the periodic table). Thus, the molecule Cl2 has a molar mass of 71.0 g/mol.

90.4 g Cl2 (1 mol / 71.0 g) = 1.27 mol Cl2

Answer 2

Hello. Here is how we can convert grams of Cl₂ to moles of Cl₂:

(90.4g) X (1 mol / 70.90g) = ________ mol of Cl₂

From the periodic table, we can determine the molar mass of Cl₂ is 70.90 g/mol.

90.4g Cl₂ divided by the molar mass of Cl₂ gives us the moles of Cl₂.