(d) A 5.6 dm sample of ethene, CH2=CH2 measured at s.tp. was reacted with 0.05 mol dm acidified potassium manganate(VII). Ethylene glycol, CH2(OH)CH(OH), is formed as the only carbon containing product. The half-equation for reduction of manganate(VII) ion is shown below. Mno + 8H* + 5e - Mn2* + 4H20 (i) Construct a half-equation for the oxidation of ethene and hence write an overall equation for the reaction between ethene and manganate(VII) ions. ...[2] (ii) Calculate the minimum volume of potassium manganate(VI) required for a complete reaction with the ethene sample. [2]

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(d) A 5.6 dm sample of ethene, CH2=CH2 measured at s.tp. was reacted with 0.05 mol dm
acidified potassium manganate(VII). Ethylene glycol, CH2(OH)CH(OH), is formed as the
only carbon containing product.
The half-equation for reduction of manganate(VII) ion is shown below.
Mnos + 8H* + 5e - Mn?* + 4H2O
(i) Construct a half-equation for the oxidation of ethene and hence write an overall
equation for the reaction between ethene and manganate(VII) ions.
...[2]
(ii) Calculate the minimum volume of potassium manganate(VI) required for a complete
reaction with the ethene sample.
[2]
Transcribed Image Text:(d) A 5.6 dm sample of ethene, CH2=CH2 measured at s.tp. was reacted with 0.05 mol dm acidified potassium manganate(VII). Ethylene glycol, CH2(OH)CH(OH), is formed as the only carbon containing product. The half-equation for reduction of manganate(VII) ion is shown below. Mnos + 8H* + 5e - Mn?* + 4H2O (i) Construct a half-equation for the oxidation of ethene and hence write an overall equation for the reaction between ethene and manganate(VII) ions. ...[2] (ii) Calculate the minimum volume of potassium manganate(VI) required for a complete reaction with the ethene sample. [2]
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