The diameter of a carbon atom is 0.154 m. what is the this number expressed in scientific notation

1.54^-10 m, you bring the decimal point back to the position after the first whole number and count the places it took to get it there. If you're moving it backwards, the exponent will be negative, and if you're moving it forwards the exponent will be positive

The answer is 3.

  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