Question

How many moles are in 200 grams of CaF2

Answer 1

`\huge{ \boxed{2.63 \: moles}}`

Step-by-step explanation:

The number of moles of
`CaF_2` can be found by using the formula:

`n = (m)/(M)`

where:

m is the mass in grams

M is the molar mass in g/mol

n is the number of moles

From the question

m = 200 g

The molar mass(M) of
`CaF_2` = 40 + (18 × 2) = 40 + 36 = 76 g/mol

`\therefore \: n = (200)/(76) \\ = 2.63 \: moles`

Answer 2

To calculate the number of moles of CaF2 in 200 grams, one must determine the molar mass of CaF2 (78.08 g/mol) and perform dimensional analysis, which results in 2.56 moles of CaF2.

Step-by-step explanation:

To calculate the number of moles in 200 grams of CaF2 (calcium fluoride), we first need to determine the molar mass of CaF2. The molar mass is the sum of the masses of calcium and two fluorine atoms. The molar mass of calcium (Ca) is 40.08 g/mol and fluorine (F) has a molar mass of 19.00 g/mol. Therefore, the molar mass of CaF2 is:

Ca: 1 x 40.08 = 40.08 g/mol

F: 2 x 19.00 = 38.00 g/mol

Total: 40.08 g/mol + 38.00 g/mol = 78.08 g/mol

Next, we use the molar mass to convert grams to moles using dimensional analysis:

Number of moles = (mass in grams) / (molar mass in g/mol)
Number of moles of CaF2 = 200 g / 78.08 g/mol
Number of moles of CaF2 = 2.56 moles

Therefore, there are 2.56 moles of CaF2 in 200 grams.