What conclusion was drawn from the discovery that gallium and eka-aluminum were the same element? a. mendeleev’s periodic table allowed for accurate predictions about undiscovered elements. b. two dissimilar elements could in fact be one and the same. c. combining elements into one allowed for more room in the periodic table.

Answersublimation;

Ithink the correct answer is 3

The answer is d for this question

  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