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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: killua_gon on September 25, 2007, 12:59:41 AM

Title: I need your help
Post by: killua_gon on September 25, 2007, 12:59:41 AM

I need your help.Please answer this question.
<A>. Gas was generated when Mn02 was added to 250 cm3 of 3.4% H202 solution.
 1.What is the molar concentration ( in mol/dm30 of 3.4% H202 solution.
 2. What volume ( in dm30 of the gas was generatd theoretically at 0 celcius degree and 1atm
<B>. Explain why the boiling point of HF is higher than that of HCl
Thank you for helping me!

Title: Re: I need your help
Post by: AWK on September 25, 2007, 03:10:55 AM

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1.What is the molar concentration ( in mol/dm30 of 3.4% H202 solution.

3.4 % H₂O₂ has  a density of 1.01 kg/dm³, hence you can use approximation 1kg = 1dm³ of H₂O₂. In this case calculation of molar conceetration is exceptionally easy!

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2. What volume ( in dm30 of the gas was generatd theoretically at 0 celcius degree and 1atm

Start from a balanced reaction of H₂O₂ decomposition then calcultae moles of hydrogen peroxide used, and than think a while