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(a) Copper(II) chloride contains copper ions, Cu²⁺, and chloride ions, Cl⁻ - Edexcel - GCSE Chemistry - Question 4 - 2012 - Paper 1
Question 4
(a) Copper(II) chloride contains copper ions, Cu²⁺, and chloride ions, Cl⁻. (i) What is the formula of this copper chloride? Put a cross (✗) in the box next to you... show full transcript
Worked Solution & Example Answer:(a) Copper(II) chloride contains copper ions, Cu²⁺, and chloride ions, Cl⁻ - Edexcel - GCSE Chemistry - Question 4 - 2012 - Paper 1
Step 1
What is the formula of this copper chloride?
Answer
The correct formula for copper(II) chloride is CuCl₂. This is because copper in the +2 oxidation state combines with two chloride ions, each with a -1 charge, to balance the charge. Hence, the formula reflects one copper ion and two chloride ions.
Step 2
In a reaction 0.64 g copper are reacted to produce copper chloride.
Answer
To find out how much copper(II) chloride can be produced from 0.64 g of copper, we first need to calculate the number of moles of copper:
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Calculate moles of copper:
Moles = rac{ ext{mass}}{ ext{molar mass}} = rac{0.64 ext{ g}}{63.55 ext{ g/mol}} \
= 0.0101 ext{ moles (approximately)}
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Given the formula CuCl₂, each mole of copper produces one mole of copper(II) chloride. Therefore, the moles of CuCl₂ produced will also be approximately 0.0101 moles.
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If desired, you can convert the moles of CuCl₂ to grams using its molar mass (around 134.45 g/mol):
ext{Mass of CuCl₂} = ext{moles} imes ext{molar mass} = 0.0101 ext{ moles} imes 134.45 ext{ g/mol} \
= 1.36 ext{ g (approximately)}.