(18pts) Calories per Mass of Food Report Table CP.1:...

(18pts) Calories per Mass of Food Report Table CP.1: Calorimetry Data of Burning Food Sample 1 Sample 2 Mass of can (g) 15.505 14.436 Mass of can and water (g) 114.220 112.850 Initial mass of food sample (g) 1.795 0.521 Final mass of food sample (g) 0.098 0.097 Initial temperature of water (°C) 20.9 21.6 Final temperature of water (°C) 21.9 22.5 Mass of water (g) Temperature change of water (°C) (Do not include a negative sign) Heat gained by water (cal) (Do not include a negative sign) Heat gained by water (kcal) (Do not include a negative sign) Heat lost by food (cal) (Do not include a negative sign) Heat lost by food (kcal) (Do not include a negative sign) Mass of food burned (g) Calories per gram of food (kcal/g)

Transcript

00:01 All right, let's do sample one together, and then you can follow my example to do sample two.

00:05 So first, let's find the mass of the water that's desired.

00:08 If we look at your data table, we'll see that the mass of the can in the water is 114 .22, and then we'll subtract the mass of the can away from that, and your mass of your can was 15 .505.

00:25 All right, so i'll get my calculator here.

00:27 We'll go 114 .22 minus 15 .505, and that is 98 .715.

00:37 That's grams.

00:39 Always make sure you put units.

00:41 Next thing we're looking for is a temperature change of the water.

00:45 A temperature change will be the final temperature minus the initial temperature.

00:48 So final temperature of the water is 21 .9 degrees celsius.

00:53 The initial temperature was 20 .9 degrees celsius, so the temperature change is 1 .0 degrees celsius.

01:01 Third thing, heat gained by the water in calories.

01:05 So we need to remember the specific heat of water in calories is 1 calorie per gram degree celsius.

01:15 So we're going to use q equals mc delta t, and we'll take the mass, the 98 .715 grams.

01:25 That's just 1 grams times the 1 calorie per gram degree celsius times the 1 degree celsius.

01:37 So that ends up being a pretty easy calculation, right? because it's just going to end up being 98 .715 calories.

01:45 And it said to ignore the negative sign, so we'll go ahead and ignore that sign.

01:50 Next, it wants that turned into kilocalories.

01:55 So if we want to turn anything from a base unit into a kilo unit, you have to multiply or divide by a thousand.

02:02 Okay, so 1 kilocalorie is equal to a thousand calories...

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