The molar mass of calcium chloride (cacl2) is 110.98 g/mol. if you were to calculate the number of moles in 23.4 g of cacl2, which example shows the correct way to set up the calculation

 The  example   which  show   the   correct  way  to  set  up  the  calculation  of  moles   of CaCl2  is  calculated   as follows

moles  of  CaCl2  = mass  of CaCl2(23.4 g/molar mass  of  CaCl2 ( 110.98 g/mol)

moles  of CaCl2 =  23.4 g/ 110.98   g/mol =  0.211   moles
grams  will    cancel    out  each  other

The answer is probably c. xylem