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In this experiment, the principles of stoichiometry are explored by creating S'mores, the delicious combination of chocolate, marshmallow, and graham crackers. The term 'stoichiometry' originates from 'stoichio' meaning element and 'metry' meaning the process of measuring. It involves determining the mass and quantity relationships among reactants and products in a chemical reaction.
The purpose of this experiment is to identify the limiting reactant in the synthesis of S'mores.
A chemical equation represents the reactants on the left and the products on the right, indicating the compounds involved in a reaction.
Coefficients in a balanced chemical equation specify the relative amounts of molecules or moles of each substance involved in the reaction.
Substance | Symbol | Unit mass | Package Mass |
---|---|---|---|
Graham Cracker Squares | Gr | 8.50 g | 408 g |
Marshmallow | Mm | 7.125 g | 285 g |
Miniature Chocolate Bar | Ch | 12.00 g | 348 g |
A S'more consists of 2 graham cracker squares, 1 marshmallow, and 1 miniature chocolate bar.
2Gr + 1Mm + 1Ch → 1S'more
Ratio | Value |
---|---|
2 Gr = 1 Mm | 2 Gr = 1 Mm |
2 Gr = 1 S'more | 2 Gr = 1 S'more |
1 Ch = 1 Mm | 1 Ch = 1 Mm |
1 Ch = 2 Gr | 1 Ch = 2 Gr |
1 Ch = 1 S'more | 1 Ch = 1 S'more |
1 Ch = 1 Gr | 1 Ch = 1 Gr |
Gr = 8.50 g x 2 + Mm = 7.125 g + Ch = 12.00 g = 36.12 g
Yes, the mass of the reactants combined equals the mass of the S'more.
The Law of Conservation of Mass.
Substance | Quantity | # of S'mores it COULD make |
---|---|---|
Graham Cracker Squares | 42 | 21 |
Marshmallow | 55 | 55 |
Miniature Chocolate Bar | 11 | 11 |
The limiting reactant will be the Miniature Chocolate Bar.
4 marshmallows and 2 graham cracker squares will remain.
Excess Graham Cracker Squares: 2 Gr = 17 g; Excess Marshmallows: 4 Mm = 28.5 g
Based on the limiting reactant (1 Miniature Chocolate Bar), we predict we can make 11 S'mores.
Were you correct?
Yes, we were correct.
The reaction stopped when the Miniature Chocolate Bar was completely used.
Because the Miniature Chocolate Bar was the limiting reactant, and once it was depleted, the reaction could not proceed further.
The limiting reactant is graham cracker squares (Gr).
Excess Chocolate (Ch): 24 g; Excess Marshmallows (Mm): 14.25 g
Mass of Excess Chocolate (Ch): 24 g; Mass of Excess Marshmallows (Mm): 14.25 g
There are 40 marshmallows in a whole package.
You would need 80 graham cracker squares and 40 miniature chocolate bars to consume an entire package of marshmallows.
The mass needed is 680 g of graham crackers and 480 g of chocolates to consume an entire package of marshmallows.
You would need 2 bags of marshmallows and 2 bags of miniature chocolate bars to make this many S'mores.
The maximum number of S'mores that can be made with one box of graham crackers is 46.
You would need 46 units of marshmallows and 23 units of chocolate to consume an entire package of marshmallows.
The mass needed is 759 g of marshmallows and 494.5 g of chocolates to consume an entire package of marshmallows.
You would need 1 bag of marshmallows and 2 bags of miniature chocolate bars to make this many S'mores.
Stoichiometry of S'mores Synthesis: Lab Report. (2024, Jan 09). Retrieved from https://studymoose.com/document/stoichiometry-of-s-mores-synthesis-lab-report
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