Grade 11Physical Chemistry
The volume of O2 at STP liberated in a decomposition of 85g of 75 percent pure H2O2 is 3x litres. Find x
The volume of O2 at STP liberated in a decomposition of 85g of 75 percent pure H2O2 is 3x litres. Find x
1 Answer
Abhiraj Pathak
Decomposition of H2O2 is as followsH2O2-->H2O + 1/2 O275% 85g of H2O2 will weigh 63.75g63.75g will have 3.57 moles.Since 1 mole of H2O2 decomposes to 1/2 O2,3.57 moles of H2O2 will give 1.77 moles of O2.1.77 moles of O2 will have a volume of 1.77*22.4L = 39.66Since given is 3x L of O2 is liberated,Thus 3x = 39.66x = 13.22 L
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