The use of freons is being phased out because of the damage these compounds do to the stratospheric ozone layer. One of the freons, CCl2F2, is manufactured by reacting carbon tetrachloride with hydrogen fluoride. The other reaction product is hydrogen chloride. What is the yield of this reaction if a manufacturer obtains 155 kg of CCl2F2 from 285 kg of CCl4? (Enter the yield in percent)
It is 69.2
here's where I have a problem
Given this reaction yield, how many kg of hydrogen fluoride should be used to make 690 kg of CCl2F2?