Understanding the concept of moles is crucial in chemistry, as it allows us to determine the quantity and relationships between different substances involved in a chemical reaction. In this article, we will explore how to calculate the moles of a substance, specifically 2.50 g of CuCl2.

To determine the moles of 2.50 g of CuCl2, we will employ the formula:

“`
Moles = Mass (in grams) / Molar Mass (in grams per mole)
“`

The molar mass of CuCl2 is 134.45 g/mol. Substituting the given mass and molar mass, we get:

“`
Moles of CuCl2 = 2.50 g / 134.45 g/mol = 0.01858 moles
“`

Therefore, 2.50 g of CuCl2 is equal to 0.01858 moles.

Molar Mass and Its Significance

The molar mass of a compound represents the mass of one mole of that compound. It is a fundamental property that enables us to convert between mass and the number of moles of a substance. The molar mass is expressed in grams per mole (g/mol).

For instance, the molar mass of CuCl2 (copper(II) chloride) is 134.45 g/mol. This means that one mole of CuCl2 has a mass of 134.45 grams. Similarly, 2.50 g of CuCl2 is equivalent to 0.01858 moles because 134.45 g of CuCl2 is equal to 1 mole.

Calculating Moles Using the Periodic Table

The periodic table provides a wealth of information about elements and their properties, including atomic masses. These atomic masses can be used to determine the molar mass of a compound.

To calculate the molar mass of a compound, we multiply the atomic mass of each element in the compound by its subscript and then add the results together. For example, the molar mass of CuCl2 is calculated as follows:

“`
Molar Mass = (Atomic Mass of Cu × Subscript of Cu) + (Atomic Mass of Cl × Subscript of Cl)
“`

“`
Molar Mass of CuCl2 = (63.55 g/mol × 1) + (35.45 g/mol × 2) = 134.45 g/mol
“`

Once we have the molar mass, we can calculate the moles of a given mass of the compound using the formula:

“`
Moles = Mass (in grams) / Molar Mass (in grams per mole)
“`

Example Calculation for 2.50 g of CuCl2

Let’s revisit our example of 2.50 g of CuCl2. Using the molar mass calculated above (134.45 g/mol), we can determine the moles as follows:

“`
Moles of CuCl2 = 2.50 g / 134.45 g/mol = 0.01858 moles
“`

Therefore, 2.50 g of CuCl2 is equivalent to 0.01858 moles.

Tags:

Share:

Related Posts :

Leave a Comment