Respuesta :
Explanation:
It is given that 44.45 g of hydrocarbon gas produces 2649 kJ or [tex]2649 \times 10^{3} J[/tex] of heat.
Also here, 1 lb = 453.592 g.
Therefore, amount of energy released by 453.592 g of hydrocarbon gas will be calculated as follows.
[tex]\frac{2649 \times 10^{3} J \times 453.592 g}{44.45 g}[/tex]
= [tex]27.03 \times 10^{6} J[/tex]
It is known that 1 J = [tex]2.778 \times 10^{-7} Kwh[/tex].
Hence, [tex]27.03 \times 10^{6} J[/tex] = [tex]27.03 \times 10^{6} J \times 2.778 \times 10^{-7} Kwh/J[/tex]
= 7.508 Kwh
Thus, we can conclude that the combustion of exactly one pound of this hydrocarbon gas produce 7.508 Kwh energy.
