A barrel of crude oil was placed so that it was attached to a distillation tower. If the barrel were heated to a temperature of 250°C, it would still contain

Explanation:

Distillation is a separation technique used to separate constituents of a mixture based on difference in there boiling points. Constituents of crude oil are also separated based on there boiling points. When the crude oil is heated above 250°C, diesel oil, gas oil, mineral oils, fuel oil, waxes and tars will be left in the mixture while constituents such as kerosene, fuel gas and petrol would have been separated/distilled out.

i believe it is c.) 1575 j.

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year