A mixture of oxygen, nitrogen, and hydrogen gases exerts a total pressure of 74 kPa. The partial pressure of the oxygen is 21 kPa and the partial pressure of the nitrogen is 45 kPa. What is the partial pressure of the hydrogen gas in this mixture? (1 sig fig)

The answer is d. hope i !

The answer is a. stable, hope i ya

  the volume of  0.220 m k2s    solution  required  to  completely  react with 175 ml  of 0.115m co(no3)2  calculate the moles  of co(no3)2 =  molarity x volume/1000175 x0.115/1000= 0.02  moleswrite  the reacting  equationk2s(aq)  +  co(no3)2  = 2 kno3(aq)  + cos(s)by  use  of mole ratio between k2s to co(no3)2 which  is  1: 1 the moles of k2s is therefore = 175  x0.115/1000= 0.02  molesvolume = moles/molarity=0.02/0.22=0.09  ml  of k2s

Definitely 25.3 degrees celsius