240,000 barrels contain a total of:
240,000 barrels * 42 gal per barrel = 240,000*42 gal = 10,080,000 gal of petroleum.
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now we need to convert gallons to Liters. For this we use the conversion:
1 US liquid gallon = 3.78541 Litre,
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thus 10,080,000 gal are 10,080,000*3.78541 Litre = 38,156,932.8 Litre
Answer: 38,156,932.8 Litre