How many moles of h atoms are there in 81.1969 grams of c2h4cl2? plz show work

Which position represents spring in the southern hemisphere? a) b) c) d)

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

Liquid from a brewery fermentation contains 10% ethanol and 90% water. part of the fermentation product (50,000 kg/h) is pumped to a distillation column on the factory site. under current operating conditions, a distillate of 45% ethanol and 55% water is produced from the top of the column at a rate of one-tenth that of the feed. what is the composition of the waste "bottoms" from the still?