Answer
333,000,000 kcal
Work Step by Step
1. Note that 21kJ/g of energy is equal to 5kcal/g.
2. Obtain the dry mass of wheat by subtracting the amount of water present from the original mass
333,000kg x 0.8 = 266,400kg water
dried wheat = 333,000kg - 266,400kg = 66,600kg
3. Calculate the energy content using the relationship indicated in step 1.
66,600kg x $\frac{1000g}{1kg}$ x $\frac{5kcal}{g dried wheat}$ = 333,000,000 kcal
