On july 23, 1983, air canada flight 143 required 22,300 kg of jet fuel to fly from montreal to edmonton. the density of jet fuel is 0.803 g/ml, or 1.77 lb/l. the plane had 7682 l of fuel on board in montreal. the ground crew there multiplied the 7682 l by the factor 1.77(without units) and concluded that they had 13,597 kg of fuel on board and needed an additional 8703 kg by the factor 1.77(again without units) and concluded they needed to add 4916 l of fuel. they added 5000l. on its flight, the plane ran out of fuel and crash-landed near winnipeg, hundreds of kilometers short of its destination. (there were few injuries and no fatalities.) what mistake did the ground crew make? how much fuel(in l) should they have added before takeoff?