Part complete the first-order reaction, 2 n2o(g) → 2 n2(g) + o2(g), has a rate constant equal to 0.76 s-1 at 1000 k. how long will it take for the concentration of n2o to decrease to 32 % of its initial concentration?

  The  time  taken  for  the  concentration  of N2O  to  decrease  to  32%   of  its   initial   concentration  is  calculated  as  follows
  In(A1/A0)=-Kt
A1=  final  concentration  =  32/100=0.32
A0= initial   concentration  =100/1000=1
K= constant=  0.76  per  sec

time  is  therefore  calculated  as follows
In(0.32/1)=  -0.76 t
-1.1394  =-0.76t  divide  both  sid3es  by  -0.76
t  is  therefore=  1.5  s

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.