Answer to Question #62511 in General Chemistry for Lauren

Question

(5)
World energy supplies are often measured in the unit of quadrillion British thermal units (1012 Btu), generally called a "quad." In 2015, world energy consumption is projected to be 5.81 ×1017kJ.

The use of the British thermal unit (Btu) is common in much engineering work. (1 Btu = 1054J) A Btu is the amount of heat required to raise the temperature of 1 lb of water by 1 ∘F. How many quads of energy does world energy consumption quantity represent?

Answer 1

1 Btu = 1054 J
Projected world energy consumption is 5.81 ×10^17 kJ = 5.81 x 10^20 J, which is equal:
5.81 x 10^20 J / 1054 J = 5.51 x 10^17 Btu.