For a system at constant pressure,19,400 calories of heat are released.This quantity of heat is equivalent to

Question

Quizplus · Accepted Answer

The conversion factor between calories and joules is 1 calorie = 4.184 joules. Therefore, we can convert the given quantity of heat as follows:

19,400 calories x 4.184 J/cal = 81,268 J

To express this quantity in scientific notation, we move the decimal point to be after the first digit and multiply by 10 raised to the appropriate power:

81,268 J = 8.1268 x 10^4 J ≈ 8.12 x 10^4 J

The only answer choice that matches this value is D.

For a System at Constant Pressure,19,400 Calories of Heat Are