complete the following table. be sure each of your answer entries has the correct number of significant…

Explanation:

Step1: Recall conversion factors

1 kcal = 1000 cal, 1 kcal = 4.184 kJ

Step2: Convert energy of baked - potato

For a baked potato with 2.20×10⁵ cal: To convert to kcal, divide by 1000. So, $\frac{2.20\times 10^{5}}{1000}=220$ kcal. To convert to kJ, first convert to kcal (220 kcal) and then multiply by 4.184. So, $220\times4.184 = 920.48\approx920$ kJ (3 significant digits as 220 has 3 significant digits).

Step3: Convert energy of chicken - noodle soup

For a cup of chicken - noodle soup with 75.0 kcal: To convert to cal, multiply by 1000. So, $75.0\times1000 = 75000$ cal. To convert to kJ, multiply by 4.184. So, $75.0\times4.184=313.8\approx314$ kJ (3 significant digits as 75.0 has 3 significant digits).

Step4: Convert energy of cooked corn

For an ear of cooked corn with 356 kJ: To convert to kcal, divide by 4.184. So, $\frac{356}{4.184}\approx85.1$ kcal. To convert to cal, first convert to kcal (85.1 kcal) and then multiply by 1000. So, $85.1\times1000 = 85100$ cal.

Answer:

food	energy content when eaten
	cal	kcal	kJ
a baked potato	$2.20\times 10^{5}$	220	920
a cup of chicken noodle soup	75000	75.0	314
an ear of cooked corn	85100	85.1	356