Which of the following is not a feature of iron (iii) oxide?
(a) red-orange in colour
(b) forms a protective barrier
(c) falls off in flakes
(d) requires moisture to form

How many liters of ethylene glycol antifreeze (c2h6o2), with a density of 1.100 g/l, would you add to your car radiator containing 15.0 kg of water if you needed to protect your engine to - 21.5°c? for water, kf = 1.86°c m -1.