how many moles of (CO(NH2)2 are present in 135 g of water, if the freezing point of the solution is -4.02 degrees Celsius?

how many moles of (CO(NH2)2 are present in 135 g of water, if the freezing point of the solution is -4.02 degrees Celsius? kf(water)= 1.86K KG/mol.1) 0.292 mol2) 0.303 mol3)0.216 mol4)0.238 mol5)0.259 mol6)non of these