- use the report values from the packaged food label to calculate the declared e
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- use the report values from the packaged food label to calculate the declared energy content of the snack in Calories per gram. Report the calculated answer to two decimal places and record in table? rade Identification of an Unknown Ionic Compound at the beginning of lab omplete the Pre-lab questions (found at the end of this handout) by dout in the space provided. At the beginning of the lab I will stamp them. CHEM& 121 1 and Procedural Outline on a separate sheet(s) ofpaper and attach to ginning of the lab I will stamp them as wel of your qualitative tests to CHEM&121 Lab 3: Heat Content of Snacks Andrewsky (adapted from Lucas) (5 pts) Table #1, Heat content of a snack food using calorimetry T-_ Trial #2 Trial #3 Trial #1 chip 100 0 ml co. 2. 233 Dorite Snack used Volume of water (mL) Mass of water (g) Mass of snack (g) Initial temperature (°C) Final temperature (°C) 100.0 mL 2.25 .951 1400.00 cal 1100.co cal | Goo.00 cal Heat absorbed by water (cal) 1.40 Cal 10 Cal 0.60 Cal Heat released by snack (food Cal) 0.62Gl Energy content of snack (Ca/g) o.sial2Ca o 48 (al Average energy content of snack (Cal/g) Energy content of snack from food label (Cal/g) % Difference CALCULATIONS All work must be shown for calculations for at least one trial. Include the final answers 1. (I pt) For cach trial, determine the mass (in grams) of the heated water. The density of water is l appropriate units and circle i gmL. Report the calculated answer to two decimal places and record in Table #1. 1000 1.c0Explanation / Answer
Hi
The calculation of energy content begins with calculation of its water content. In the table you have rightly calculated the water sample and its energy value. The formula to determine the energy content = Q = mCp deltaT
where, m - mass of water in g, Cp = 1C/g; delta T = temperature difference.
Upond using it in our question, we arrive at 1100 Cal.
The food calory = 1000 calories
So 1100 calory = 1.100 food calories
The snakes weights 1.951g. So the heat conent per gram = 1.1 / 1.951 = 0.56 cal /g
The energy content of doritos chips is not given in the question. { The usual serving contain 30g and has 150 cal]
You just have to find the cal/g value and determine the difference between the value you calculated and the value given on the snaks label.
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