Lab 8 S'more Stoichiometry

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University of Arkansas, Fayetteville *

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3613

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Chemistry

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Dec 6, 2023

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docx

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3

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Lab 8: S’more Stoichiometry Attribution: " S'more Stoichiometry " by Erika Brock is licensed under CC BY-NC-SA 3.0 /Modified procedure from original Background “Stoicheion” means element and “metron” means measure. The mass and quantity (mole) relationships among reactants and products in a reaction are found using the process of stoichiometry. Purpose To determine the following: 1) If you are given one bag of large marshmallows, what is the maximum number of S’mores that can be made? 2) How many boxes of graham crackers and how many chocolate bars are needed to make this many S’mores? Objectives To practice stoichiometry. To calculate limiting reagent. Activities 1. Using the mass of a marshmallow, graham cracker, and chocolate piece from the data sheet on the next page, complete the remaining questions.
Lab 8 Data Sheet Name __________________________ Substance Symbol Unit mass (g) Graham cracker S 6.99 g Marshmallow Mm 7.1 g Chocolate Piece Or 3.66 g S’more S 2 MmOr 3 1. Calculate the unit mass of the S’more (S 2 MmOr 3 ) below and add it to the table above. 17.75 2. a. Write a balanced chemical equation that explains how a s’more is made. 2s+1mm+3or b. What does the equation tell you? What ingredients are used for the smore c. What do the coefficients represent? The amount of each item, 2 grahams, 1 marshmallow, and 3 pieces of chocolate 3. Based on the masses in your data table, if you had a bag of marshmallows with a mass of 454 g, how many marshmallows are in the bag? Show your work. 454/7.1 = 63.94 So about 63 marshmallows 4. How many units of graham crackers and chocolate pieces are needed to make the maximum number of s’mores with the number of marshmallows calculated above? Show your work. a. Number of graham crackers needed: 63 smores can be made and you need 2 graham crackers per smore, so 63x2= 126 b. Number of chocolate pieces needed:
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