Which statement best explains why water has a higher boiling point than ethane?
ethane molecules are smaller than water and can move faster.
water molecules need relatively less heat energy to move.
water molecules form hydrogen bonds, which cannot be broken by heating water.
ethane molecules have no hydrogen bonds and need less energy to separate.

Ethane molecules have no hydrogen bonds etc is the answer

Ibelieve the answer is balance! hope my answer has you : )

  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