SSCE HSC Chemistry Alcohols: The graph shows the mass and amo

The graph shows the mass and amount of carbon, fluorine and chlorine atoms in one mole of a compound - HSC - SSCE Chemistry - Question 12 - 2003 - Paper 1

Question 12

The graph shows the mass and amount of carbon, fluorine and chlorine atoms in one mole of a compound. What is the molecular formula for this compound? (A) CF₂Cl (B... show full transcript

Worked Solution & Example Answer:The graph shows the mass and amount of carbon, fluorine and chlorine atoms in one mole of a compound - HSC - SSCE Chemistry - Question 12 - 2003 - Paper 1

Step 1

Identify Elements and Their Amounts

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Answer

From the graph, we can see the following information:

Mass of Carbon: 12 g
Mass of Fluorine: 38 g
Mass of Chlorine: 71 g

The amount of moles can be calculated using the formula:

ext{moles} = rac{ ext{mass (g)}}{ ext{molar mass (g/mol)} }$$ The molar masses are approximately: - Carbon (C): 12 g/mol - Fluorine (F): 19 g/mol - Chlorine (Cl): 35.5 g/mol

Step 2

Calculate Moles of Each Element

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Answer

Calculating the moles for each element:

For Carbon: $moles_C = rac{12 ext{ g}}{12 ext{ g/mol}} = 1 ext{ mol}$
For Fluorine: $moles_F = rac{38 ext{ g}}{19 ext{ g/mol}} = 2 ext{ mol}$
For Chlorine: $moles_{Cl} = rac{71 ext{ g}}{35.5 ext{ g/mol}} \\ ext{approximately} \\ 2 ext{ mol}$

Step 3

Determine Molecular Formula

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Answer

The ratio of the elements in the compound is:

Carbon: 1
Fluorine: 2
Chlorine: 2

Thus, the empirical formula is C₁F₂Cl₂. To express this as a molecular formula:

The ratio can be simplified to: $C_1F_2Cl_2 = C_2F_2Cl_2$

Therefore, the molecular formula for the compound is: C₂F₂Cl₂

Step 4

Select the Correct Option

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Answer

The correct answer from the options given is: (D) C₂F₂Cl₂

The graph shows the mass and amount of carbon, fluorine and chlorine atoms in one mole of a compound - HSC - SSCE Chemistry - Question 12 - 2003 - Paper 1

Worked Solution & Example Answer:The graph shows the mass and amount of carbon, fluorine and chlorine atoms in one mole of a compound - HSC - SSCE Chemistry - Question 12 - 2003 - Paper 1

Identify Elements and Their Amounts

Calculate Moles of Each Element

Determine Molecular Formula

Select the Correct Option

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