If an aqueous solution of CO(NH₂)₂ freezes at –4.02°C, how many moles of CO(NH₂)₂ are present in 131 g of water? (K_f water = 1.86 °C•kg/mol)

• A. 0.337 mol
• B. 337 mol
• C. 1.01 mol
• D. 101 mol
• E. 3.29 mol
• F. None of the above.

Answer: (A)