What is the percent by mass of H in toluene (C7H8)? The molecular weight of carbon is 12.0107 g/mol and of hydrogen 1.00794 g/mol. Answer in units of %.

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.