A piece of chalk, has an initial mass of 43. 5 grams. The mass of the chalk decreased to 39. 6 grams after use. Which of these is the closest value to the amount of chalk used?.

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.