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Q1
A teacher investigated the reaction of iron with chlorine using the apparatus
in the above diagram.
The word equation for the reaction is:
iron + chlorine → iron chloride
The teacher weighed:
• the glass tube
• the glass tube and iron before the reaction
• the glass tube and iron chloride after the reaction.
Table 2 shows the teacher’s results.
Calculate the simplest whole number ratio of:
moles of iron atoms : moles of chlorine atoms
Determine the balanced equation for the reaction.
Relative atomic masses (Ar): Cl = 35.5 Fe = 56
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Moles of iron atoms : moles of chlorine atoms = _________: __________
Equation for the reaction _______________________________________
(6)
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Moles of Fe = 4.48 ÷ 56 = 0.08
Moles of Cl = 8.52 ÷ 35.5 = 0.24Ratio of Fe : Cl = 0.08 : 0.24 = 1 : 3
Balanced equation:
2Fe + 3Cl₂ → 2FeCl₃

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