What is the mole fraction of urea in a solution that contains 2.1 mol of urea and 4.4 mol of water?

 The mole  fraction  of urea  in  a solution that contain  2.1  mol  Urea   and 4.4 mole  of  water  is  0.32 

       calculation

mole  fraction = moles of urea/ total  mole

moles of  urea =  2.1  mole

calculate  the  total  mole
 = 2.1  mole +  4.4 mole =  6.5

Mole fraction  is therefore =  2.1/.6.5 =  0.32

10.063g / 10.00 ml = 1.0063 g/ml which rounds off to 4 sig figs as: 1.006 g/ml