Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at 0°C will be (Kf for water = 1.86 K kg/mol, and molar mass of ethylene glycol = 62 g/mol)

ΔTf = kf.m
0 - (-0) = 1.86m
m = 0/1.86 = 0
This means that the molality should be 0 to prevent freezing at 0°C. However, this is not physically possible. There must be an error in the question or provided data. Let's assume the question meant to ask about preventing freezing at a temperature below 0°C. We'll need additional information such as the desired freezing point to accurately calculate the mass of ethylene glycol needed.