How many joules are there in 1.86 kcal? (1 calorie = 4.184 J) A)8 × 10^-3 J B)8 × 10³ J C)7.780 J D)4 × 10² J E)0.444 J

Name: How many joules are there in 1.86 kcal? (1 calorie = 4.184 J) A)8 × 10 -3 J B)8 × 10 3 J C)7.780 J D)4 × 10 2 J E)0.444 J
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Question

Quizplus · Accepted Answer

1.86 kcal = 1.86 x 10^3 cal (since 1 kcal = 1000 cal)
1 cal = 4.184 J
Therefore,

1.86 x 10^3 cal = (1.86 x 10^3) x (4.184) J = 7.780 x 10^3 J = 7.78 kJ

Option B is the closest to this value, 8 x 10^3 J, and is therefore the correct answer.

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