Question

How many atoms of Fluorine are in 2.3 grams of CaF2? Please help me! I need to know how to solve this question incase it shows up on my test tmrw!

Answer 1

1.79×10^22 atoms

Step-by-step explanation:

Given:

Mass of CaF2 = 2.3 grams

Step 1: Find Moles of CaF2

Molar mass of CaF2 = 77.076 g/mol

77.076g/mol (calculation not shown here)

Use the formula:

moles=mass/molar mass

Thus, 2.3g/77.076g

≈0.0298mol

Step 2: Convert Moles to Atoms

Avogadro's number (6.022×10^23) represents the number of atoms in one mole.

number of atoms=moles×Avogadro’s number

number of atoms≈0.0298mol×(6.022×10^23atoms/mol)

≈1.79×10^22

So, there are approximately 1.79×10^22 atoms of fluorine in 2.3 grams of CaF2.

Answer 2

To find the number of atoms of fluorine in 2.3 grams of CaF2, you can follow these steps:

• Calculate the molar mass of CaF2.
• Convert the given mass of CaF2 to moles.
• Use the mole ratio between CaF2 and fluorine atoms to find the number of moles of fluorine.
• Finally, use Avogadro's number to convert moles of fluorine to the number of atoms.

Here's how you can solve it:

1. The molar mass of CaF2 is the sum of the molar masses of calcium (Ca) and two fluorine (F) atoms.

• The molar mass of CaF2 = 40.08 g/mol (Ca) + 2 * 19.00 g/mol (F) = 78.08 g/mol.

2. Convert the given mass of CaF2 to moles using the molar mass:

• Moles of CaF2 = Given mass / molar mass = 2.3 g / 78.08 g/mol.

3. Use the mole ratio between CaF2 and fluorine atoms:

• In 1 mole of CaF2, there are 2 moles of fluorine atoms.

4. Finally, use Avogadro's number to find the number of fluorine atoms:

• Number of fluorine atoms = Moles of CaF2 * 2 * Avogadro's number.

By following these steps, you can calculate the number of fluorine atoms in 2.3 grams of CaF2. Good luck with your test!

Step-by-step explanation: