Answer :

To determine how many moles are in 99.8 grams of Cl₂ (chlorine gas), you can use the formula:

[tex]\[ \text{moles} = \frac{\text{mass}}{\text{molar mass}} \][/tex]

Here’s a detailed step-by-step solution:

1. Identify the Molar Mass of Cl₂:
Chlorine (Cl) has an approximate atomic mass of 35.453 grams/mol. Since Cl₂ consists of two chlorine atoms, the molar mass of Cl₂ is:
[tex]\[ 2 \times 35.453 = 70.906 \, \text{grams/mol} \][/tex]

2. Determine the Given Mass:
The problem states that you have 99.8 grams of Cl₂.

3. Use the Formula to Calculate Moles:
Plug the given mass and molar mass into the formula to find the number of moles:
[tex]\[ \text{moles of Cl₂} = \frac{99.8 \, \text{grams}}{70.906 \, \text{grams/mol}} \][/tex]

4. Calculate the Result:
When you perform the division, you get approximately:
[tex]\[ \text{moles of Cl₂} \approx 1.41 \, \text{moles} \][/tex]

Therefore, there are about 1.41 moles of Cl₂ in 99.8 grams of chlorine gas.

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Rewritten by : Barada