question_answer 1)

  Calculate the strength of 5 volume \[{{H}_{2}}{{O}_{2}}\] solution.

Answer:

  5 volume \[{{H}_{2}}{{O}_{2}}\]solution means that 1 volume of this solution will decompose to give 5 volumes of oxygen at STP. \[\underset{68g}{\mathop{2{{H}_{2}}{{O}_{2}}}}\,\to {{H}_{2}}O+\underset{22.4L}{\mathop{{{O}_{2}}}}\,\] 5 L oxygen is obtained from                                 \[\frac{68\times 5}{22.4}g\,{{H}_{2}}{{O}_{2}}=15.08g{{H}_{2}}{{O}_{2}}\] i.e., 15 g \[{{H}_{2}}{{O}_{2}}\]is present in 1 L solution. Thus strength of the solution =15 g/L.