The normal respiratory rate for human being is 15 breaths per minute. if the average volume of air for each breath is 505 cm³ at 20°C and 99.5 kPa, what volume of air, in cubic meters and at STP, does an individual breathe in one day? (hint: 1 m³= 1,000,000 cm³)

how to make a simple air condition

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-