Question

A chemical reaction gives off 1,700 kJ of heat energy.

About how many calories is it equal to?

(1 calorie=4.18 Joules)

Responses

4.1 × 10² calories

4.1 × 10² calories

4.1 × 10³ calories

4.1 × 10³ calories

4.1×104 calories

4.1 times 10 to the power of 4 calories

4.1×105 calories

Answer 1

1700 kJ = 1,700,000 J.
Calories = 1,700,000 J ÷ 4.18 J/cal ≈ 4.07 × 10^5 cal.

So the closest choice is 4.1 × 10^5 calories.