Practice Calculation Questions Electrolysis product ratios practise exam questions for higher level GCSE AQA Edexcel OCR chemistry KS4 science Doc Brown's Chemistry calculations

Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the A_r's: H=1 and Cl=35.5:
(-) electrode: 2H⁺_(aq) + 2e^- ==> H_2(g)
(+) electrode: 2Cl^-_(aq) - 2e^- ==> Cl_2(g)
If 2 g of hydrogen was formed at the (-) electrode, what volume (dm³) of chlorine is formed at the (+) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-1]
1. 24.0
2. 48.0
3. 35.5
4. 71.0
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the A_r's: H=1 and Cl=35.5:
(-) electrode: 2H⁺_(aq) + 2e^- ==> H_2(g)
(+) electrode: 2Cl^-_(aq) - 2e^- ==> Cl_2(g)
If 12 dm³ of hydrogen was formed at the (-) electrode, what mass (g) of chlorine is formed at the (+) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-2]
1. 71.0
2. 35.5
3. 142.0
4. 106.5
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the A_r's: H=1 and Cl=35.5:
(-) electrode: 2H⁺_(aq) + 2e^- ==> H_2(g)
(+) electrode: 2Cl^-_(aq) - 2e^- ==> Cl_2(g)
If 48 dm³ of chlorine was formed at the (+) electrode, what mass (g) of hydrogen is formed at the (-) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-3]
1. 2
2. 1
3. 4
4. 8
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the A_r's: H=1 and Cl=35.5:
(-) electrode: 2H⁺_(aq) + 2e^- ==> H_2(g)
(+) electrode: 2Cl^-_(aq) - 2e^- ==> Cl_2(g)
If 36 dm³ of chlorine was formed at the (+) electrode, what volume (dm³) of hydrogen is formed at the (-) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-4]
1. 48
2. 18
3. 96
4. 36
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the A_r's: H=1 and Cl=35.5:
(-) electrode: 2H⁺_(aq) + 2e^- ==> H_2(g)
(+) electrode: 2Cl^-_(aq) - 2e^- ==> Cl_2(g)
If 213g of chlorine was formed at the (+) electrode, what volume (dm³) of hydrogen is formed at the (-) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-5]
1. 72
2. 36
3. 144
4. 96
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the A_r's: H=1 and Cl=35.5:
(-) electrode: 2H⁺_(aq) + 2e^- ==> H_2(g)
(+) electrode: 2Cl^-_(aq) - 2e^- ==> Cl_2(g)
If 8 g of hydrogen was formed at the (-) electrode, what mass of chlorine (g) is formed at the (+) electrode? [pec-6]
1. 142
2. 284
3. 71
4. 213
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al₂O₃) and the A_r's: Al=27 and O=16:
(-) electrode: 4Al³⁺_(aq) + 12e^- ==> 4Al_(l)
(+) electrode: 6O^2-_(aq) - 12e^- ==> 3O_2(g)
If 108 g of aluminium is formed at the (-) electrode, what volume (dm³) of oxygen would be formed at the (+) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-7]
1. 144
2. 96
3. 72
4. 36
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al₂O₃) and the A_r's: Al=27 and O=16:
(-) electrode: 4Al³⁺_(aq) + 12e^- ==> 4Al_(l)
(+) electrode: 6O^2-_(aq) - 12e^- ==> 3O_2(g)
If 54 tonne of aluminium is formed at the (-) electrode, what mass (tonne) of oxygen would be formed at the (+) electrode? [pec-8]
1. 60
2. 24
3. 72
4. 48
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al₂O₃) and the A_r's: Al=27 and O=16:
(-) electrode: 4Al³⁺_(aq) + 12e^- ==> 4Al_(l)
(+) electrode: 6O^2-_(aq) - 12e^- ==> 3O_2(g)
If 24 g of oxygen is formed at the (+) electrode, what mass (g) of aluminium would be formed at the (-) electrode? [pec-9]
1. 27
2. 54
3. 81
4. 108
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al₂O₃) and the A_r's: Al=27 and O=16:
(-) electrode: 4Al³⁺_(aq) + 12e^- ==> 4Al_(l)
(+) electrode: 6O^2-_(aq) - 12e^- ==> 3O_2(g)
If 2.7 g of aluminium is formed at the (-) electrode, what volume (dm³) of oxygen would be formed at the (+) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-10]
1. 3.6
2. 1.8
3. 7.2
4. 5.4
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al₂O₃) and the A_r's: Al=27 and O=16:
(-) electrode: 4Al³⁺_(aq) + 12e^- ==> 4Al_(l)
(+) electrode: 6O^2-_(aq) - 12e^- ==> 3O_2(g)
What mass (g) of aluminium is formed at the (-) electrode, if 72 dm³ of oxygen was formed at the (+) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-11]
1. 54
2. 27
3. 108
4. 81
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al₂O₃) and the A_r's: Al=27 and O=16:
(-) electrode: 4Al³⁺_(aq) + 12e^- ==> 4Al_(l)
(+) electrode: 6O^2-_(aq) - 12e^- ==> 3O_2(g)
If 54 g of aluminium is formed at the (-) electrode, what volume (dm³) of oxygen was formed at the (+) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-12]
1. 18
2. 72
3. 54
4. 36
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the A_r's: H=1 and Cl=35.5:
(-) electrode: 2H⁺_(aq) + 2e^- ==> H_2(g)
(+) electrode: 2Cl^-_(aq) - 2e^- ==> Cl_2(g)
If 2 g of hydrogen was formed at the (-) electrode, what volume (dm³) of chlorine is formed at the (+) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-1]
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the A_r's: H=1 and Cl=35.5:
(-) electrode: 2H⁺_(aq) + 2e^- ==> H_2(g)
(+) electrode: 2Cl^-_(aq) - 2e^- ==> Cl_2(g)
If 12 dm³ of hydrogen was formed at the (-) electrode, what mass (g) of chlorine is formed at the (+) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-2]
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the A_r's: H=1 and Cl=35.5:
(-) electrode: 2H⁺_(aq) + 2e^- ==> H_2(g)
(+) electrode: 2Cl^-_(aq) - 2e^- ==> Cl_2(g)
If 48 dm³ of chlorine was formed at the (+) electrode, what mass (g) of hydrogen is formed at the (-) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-3]
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the A_r's: H=1 and Cl=35.5:
(-) electrode: 2H⁺_(aq) + 2e^- ==> H_2(g)
(+) electrode: 2Cl^-_(aq) - 2e^- ==> Cl_2(g)
If 36 dm³ of chlorine was formed at the (+) electrode, what volume (dm³) of hydrogen is formed at the (-) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-4]
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the A_r's: H=1 and Cl=35.5:
(-) electrode: 2H⁺_(aq) + 2e^- ==> H_2(g)
(+) electrode: 2Cl^-_(aq) - 2e^- ==> Cl_2(g)
If 213g of chlorine was formed at the (+) electrode, what volume (dm³) of hydrogen is formed at the (-) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-5]
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the A_r's: H=1 and Cl=35.5:
(-) electrode: 2H⁺_(aq) + 2e^- ==> H_2(g)
(+) electrode: 2Cl^-_(aq) - 2e^- ==> Cl_2(g)
If 8 g of hydrogen was formed at the (-) electrode, what mass of chlorine (g) is formed at the (+) electrode? [pec-6]
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al₂O₃) and the A_r's: Al=27 and O=16:
(-) electrode: 4Al³⁺_(aq) + 12e^- ==> 4Al_(l)
(+) electrode: 6O^2-_(aq) - 12e^- ==> 3O_2(g)
If 108 g of aluminium is formed at the (-) electrode, what volume (dm³) of oxygen would be formed at the (+) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-7]
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al₂O₃) and the A_r's: Al=27 and O=16:
(-) electrode: 4Al³⁺_(aq) + 12e^- ==> 4Al_(l)
(+) electrode: 6O^2-_(aq) - 12e^- ==> 3O_2(g)
If 54 tonne of aluminium is formed at the (-) electrode, what mass (tonne) of oxygen would be formed at the (+) electrode? [pec-8]
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al₂O₃) and the A_r's: Al=27 and O=16:
(-) electrode: 4Al³⁺_(aq) + 12e^- ==> 4Al_(l)
(+) electrode: 6O^2-_(aq) - 12e^- ==> 3O_2(g)
If 24 g of oxygen is formed at the (+) electrode, what mass (g) of aluminium would be formed at the (-) electrode? [pec-9]
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al₂O₃) and the A_r's: Al=27 and O=16:
(-) electrode: 4Al³⁺_(aq) + 12e^- ==> 4Al_(l)
(+) electrode: 6O^2-_(aq) - 12e^- ==> 3O_2(g)
If 2.7 g of aluminium is formed at the (-) electrode, what volume (dm³) of oxygen would be formed at the (+) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-10]
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al₂O₃) and the A_r's: Al=27 and O=16:
(-) electrode: 4Al³⁺_(aq) + 12e^- ==> 4Al_(l)
(+) electrode: 6O^2-_(aq) - 12e^- ==> 3O_2(g)
What mass (g) of aluminium is formed at the (-) electrode, if 72 dm³ of oxygen was formed at the (+) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-11]
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al₂O₃) and the A_r's: Al=27 and O=16:
(-) electrode: 4Al³⁺_(aq) + 12e^- ==> 4Al_(l)
(+) electrode: 6O^2-_(aq) - 12e^- ==> 3O_2(g)
If 54 g of aluminium is formed at the (-) electrode, what volume (dm³) of oxygen was formed at the (+) electrode? (1 mole of any gas = 24dm³ at room temp./press.) [pec-12]

13. GCSE level exam practise calculation Questions on electrolysis product ratios @ doc brown's chemistry