oxygen →→→related chemistry?

Question

1. Calculate the volume of oxygen at STP which could be obtained from 75cm^3 of hydrogen peroxide solution which has a concentration of 68 g/dm^3.

2.1  Describe what you guy can observe when hydrogen peroxide solution is mixed with an acidified solution of potassium manganate (VII) solution.

2.2 Write balanced ionic equation of this reaction.
      I could give u [HINT=H2SO4 + MnO4^-]♥♥♥

If u are an expert and manage to answer this both I'll give you guy 5 ★

Thanks in advance##

Roger the Mole · Accepted Answer

1. 
2 H2O2 → 2 H2O + O2

(0.075 dm^3) x (68 g/dm^3 H2O2) / (34.015 g H2O2/mol) x (1 mol O2 / 2 mol H2O2) x (22.414 dm^3/mol) = 
1.7 dm^3 O2

2. 
5 H2O2 + 2 MnO4{-} + 6 H{+} → 5 O2 + 2 Mn{2+} + 8 H2O

So you should observe that oxygen gas is evolved in the form of bubbles, and that the purple color of the permanganate ions disappears.

2.2 
3 H2SO4 + 2 MnO4{-} + 5 H2O2 → 2 MnSO4 + SO4{2-} + 5 O2 + 8 H2O

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