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Chlorine is in Group 7 of the Periodic Table - OCR Gateway - GCSE Chemistry: Combined Science - Question 10 - 2019 - Paper 10

Question 10

Chlorine is in Group 7 of the Periodic Table. What is the mass of 2 moles of chlorine gas? A 35.5g B 71.0g C 106.5g D 142.0g Your answer

Worked Solution & Example Answer:Chlorine is in Group 7 of the Periodic Table - OCR Gateway - GCSE Chemistry: Combined Science - Question 10 - 2019 - Paper 10

Step 1

Determine the molar mass of chlorine gas

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Answer

Chlorine (Cl) has a molar mass of approximately 35.5 grams per mole. Since chlorine gas is diatomic (Cl<sub>2</sub>), the molar mass of chlorine gas is:

$ext{Molar mass of Cl}_2 = 2 imes 35.5 ext{ g/mol} = 71.0 ext{ g/mol}$

Step 2

Calculate the mass of 2 moles of chlorine gas

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Answer

To find the mass of 2 moles of chlorine gas, use the formula:

$ext{Mass} = ext{Moles} imes ext{Molar mass}$

Substituting the values:

$ext{Mass} = 2 ext{ moles} imes 71.0 ext{ g/mol} = 142.0 ext{ g}$

Step 3

Select the correct answer

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Answer

The mass of 2 moles of chlorine gas is 142.0 g. Therefore, the correct answer is:

D

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