Question

pre-lab:
what is the formula that is used to calculate the amount of heat absorbed or released by water during a temperature change?
q= mhf

the conversion factor for calories to joules is 4180 joules = 1 food calorie. calculate how many food calories are equivalent to 20,000 joules of heat energy.

using the nutritional information of the pringles chips, determine the amount of food calories in 1 pringles chip
26 chips have 270 calories. one chip has 9.6 calories.
then, multiply that number by 4180 to find your accepted joules for 1 chip.

Explanation:

Step1: Set up conversion ratio

We use the given conversion $4180 \text{ Joules} = 1 \text{ Food Calorie}$, so the conversion factor is $\frac{1 \text{ Food Calorie}}{4180 \text{ Joules}}$.

Step2: Calculate Food Calories

Multiply the given Joules by the conversion factor:
$20000 \text{ Joules} \times \frac{1 \text{ Food Calorie}}{4180 \text{ Joules}}$

Step3: Compute the value

$\frac{20000}{4180} \approx 4.78$

Answer:

1. The correct formula for heat absorbed/released by water during temperature change is $q = mc\Delta T$ (the provided $q=mHf$ is for phase change, not temperature change)
2. $\approx 4.78$ Food Calories
3. 9.6 Food Calories per Pringle chip, with an accepted Joule value of $9.6 \times 4180 = 40128$ Joules