The calorie (4.184 J) is defined as the quantity of energy needed to raise the temperature of 1.00 g of liquid water by 1.00°C. The British thermal unit (Btu) is defined as the quantity of energy needed to raise the temperature of 1.00 lb of liquid water by 1.00°F.
(e) How much would it cost to warm 318 gal of water in a hot tub from 15.0°C to 42.0°C by burning methane (1 gal = 3.78 L)?