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15 mL of 0.5 M H 2 O 2 reacts with 10 mL of 0.5 M KMnO 4 in excess of sulphuric acid, according to reaction 2KMnO 4 + 3H 2 SO 4 + 5H 2 O 2 → K 2 SO 4 + 2MnSO 4 + 8H 2 O + 5O 2 The volume of O 2 produced at STP is

15 mL of 0.5 M H2O2 reacts with 10 mL of 0.5 M KMnO4 in excess of sulphuric acid, according to reaction

2KMnO4 + 3H2SO4 + 5H2O2

→ K2SO4 + 2MnSO4 + 8H2O + 5O2

The volume of O2 produced at STP is

Grade:11

1 Answers

Shailendra Kumar Sharma
188 Points
6 years ago

2KMnO4 + 3H2SO4 + 5H2O2→ K2SO4 + 2MnSO4 + 8H2O + 5O2

15 ml of .5 M H2O2 i.e. 7.5 mmol of total H2O2 we have 

10 ml of .5 KmnO4 i.e. total of 5 mmol of KMnO4 we have 

Now stoichiometry, says we need 5 moles of H2O2 and 2 moles of KMnO4  which clears that H2O2 is limiting reagent. 
and other thing is with 5 mol of H2O2 gives 5 mole of O2 so 7.5 mmol of H2O2 will give 7.5mmol of O2 = 7.5 *22.4 mL =168mL

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