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S’More Stoichiometry!

Learn how to calculate the ingredients needed to make enough S’mores for a class using stoichiometry. Step-by-step guide on balancing equations, calculating moles, and converting masses. Earn your S’more by solving a practical problem.

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S’More Stoichiometry!

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  1. S’More Stoichiometry!

  2. Problem: 1. Given one bag of marshmallows, will there be enough S’mores for the class? 2. How many boxes of graham crackers and how many chocolate bars are needed for this many S’mores? 3. Given a limited amount of chocolate, how many S’mores can be made?

  3. Step 1: Write a Balanced Equation 31.00 Δ S2 + Mm + Or  S2MmOr3 The coefficients represent the ratio of the units or moles. 3

  4. Step 2: Calculating the number of ‘units’ (or moles) given. • 283 grams of Mm in a bag. • How many marshmallows?

  5. Step 3: Finding the ‘units’ of other substances in the reaction. To make enough s’mores for everyone, how many graham crackers and chocolate segments do we need? What information do we need and where do we get it? S2(s) + Mm (s) + 3Or (s) S2MmOr3(s)

  6. Step 4: Convert your ‘units’ of graham crackers and chocolate into mass values. Step 5: Convert your masses into other useful units.

  7. To Review: • Start with a _______________ equation. • Convert amount of given substance into _______________. • Relate _________ of given to ________ of wanted using a mole _____ determined by using the __________ of the balanced equation. • Convert ________ of wanted into _____. balanced units or moles units/moles units/moles ratio coefficients grams Units/moles

  8. To earn your S’more, solve the following problem (show all work!) • We could isolate silver from silver nitrate in the lab through a reaction of silver nitrate solution with a more reactive metal, such as copper, which forms copper (II) nitrate and silver. How much silver is produced from 15.00 grams of Cu?

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