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Conversion factors: 1.00 kg = 2.20 lb; 1000 g = 1 kg
no. grams = 350 lb[(1.00 kg)/(2.20 lb)](1000 g)/(1 kg) = 1.59 x 10^5 g or 159,000 g
Well, liter is a unity of volume and gram is a unity of mass. The relation between volume and mass is called density. As density is a characteristic of a substance, the relation is more or less fixed for a given substance. For example, 1 l of pure water weighs approximately 1 kg at 300 K. That is, for water 1 liter = 1000 grams.
Since one mole of water is 18 grams then 1 kg of water is 1000 / 18 = 55.56 moles so you need 55.56 * 43.9 = 2439 kJ of energy.