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What mass of hydrogen peroxide will be p...

What mass of hydrogen peroxide will be present in 2 litres of a 5 molar solution? Calculate the mass of oxygen which will be liberated by the decomposition of 200 mL of this solution.

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Molar mass of `H_(2)O_(2)=34` g `mol^(-1)`
Mass of `H_(2)O_(2)` present in 2 L of 5 molar `H_(2)O_(2)` solution
`=2xx5xx34=340" g "H_(2)O_(2)`
Mass of `H_(2)O_(2)` present in 200 mL of 5 molar `H_(2)O_(2)` solution
`=(340)/(2000)xx200=34` g
`2H_(2)O_(2)toO_(2)+H_(2)O`
So, 68 g of `H_(2)O_(2)` on decomposition will give 32 g `O_(2)`
`therefore` 34 g of `H_(2)O_(2)` on decomposition will give
`=(32xx34)/(68)=16` g `O_(2)`
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