Aluminium takes 650 MJ kg-1 to produce. How much energy is required to produce 45g?

Question

Aluminium takes 650 MJ kg-1 to produce. How much energy is required to produce 45g?

Answer 1

45g / 1000g/kg = 0.045kg.

0.045kg x 650MJ = 29.25MJ.

Answer 2

(650 Mj/Kg)*(1 Kg/1000 gm)*(45 gm) = 29.25 Mj

Answer 3

650MJ for 1 kg

so for 1 gram you divide by 1000 (1000g = 1kg)

so 650kJ for 1g

so 650 x 45 = 29250kJ = 29.25MJ per gram