To convert the answer from Joules to calories, you can use the conversion factor that 1 calorie is equal to 4.184 Joules.
So, to convert 746.844 Joules to calories:
746.844 Joules * (1 calorie / 4.184 Joules) = 178.95 calories
Rounding to the nearest whole number, the answer is approximately 179 calories. It seems that there might be a rounding or conversion error in your book.