Convert the following energy units.

Question

a) 3.80 × 10^2 kj to J.

 

b) 6.09 × 10^6 J to kcal. 

Answer 1

You should know the following conversion factors:

1 kJ = 1000 J (1x10³ J)

1 cal = 4.184 J

1 kcal = 1000 cal (1x10³ cal)

 

(a)  3.80x10² kJ x 1x10³ J/kJ = 3.80x10⁵ J

(b)  6.09x10⁶ J x 1 cal/4.184 J x 1 kcal/1x10³ cal = 1.46x10³ kcal