Sandwich stoichiometry answer key

Part 1: Cheese Sandwiches 2. Select “Sandwiches” 3. Select “Cheese” at the top 4. Use the arrows to enter the following under reactants on the left (“Before Reaction”): 8 pieces of bread 8 pieces of cheese 5.

Step 1: Ensure that the reaction is balanced. The above reaction is balanced!!! Step 2: Convert grams of FeI 3 ‍ to moles. For this we first need to calculate the molar mass of FeI ‍ = 1 (atomic mass of Fe) + 3 (atomic mass of I) = 1 (55.845) + 3 (126.904) = 55.845 + 380.712 = 436.557 g. Create your own sandwich and then see how many sandwiches you can make with different amounts of ingredients. Do the same with chemical reactions. See how many products you can make with different amounts of reactants. Feb 14, 2019 ... Answer Key. Chapter 1 · Chapter 2 · Chapter 3 ... sandwich 1 slice of cheese + 2 slices of bread ⟶ 1 sandwich ... stoichiometry. The reactant .....View PhET Sandwich Stoichiometry ch.docx from CHEMISTRY 1E03 at McMaster University. Sandwich Stoichiometry Part I : Cheese Sandwiches 1. Go to the PhET simulation: Reactants, Products & LeftoversChem 115 POGIL Worksheet - Week 4 Moles & Stoichiometry Answers Key Questions & Exercises. 1. The atomic weight of carbon is 12.0107 u, so a mole of carbon has a mass of 12.0107 g. Why doesn’t a mole of carbon weigh 12 g? The atomic weight refers to the weighted average of masses of the isotopes comprising a naturally occurring sample of …

View 1.3 LAB.pdf from CHEM 1321 at Virtual High School. Chemistry B Sandwich Stoichiometry 40 Points Directions: 1. Go to the PhET simulation website: Sandwich Stoichiometry. Answer the followingView PhET Sandwich Stoichiometry ch.docx from CHEMISTRY 1E03 at McMaster University. Sandwich Stoichiometry Part I : Cheese Sandwiches 1. Go to the PhET simulation: Reactants, Products & LeftoversStoichiometry Practice Problems. This is a comprehensive, end-of-chapter set of practice problems on stoichiometry that covers balancing chemical equations, mole-ratio calculations, limiting reactants, and percent yield concepts. The links to the corresponding topics are given below. The Mole and Molar Mass.Founded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations. PhET sims are based on extensive education <a {{0}}>research</a> and engage students through an intuitive, game-like environment where students learn through exploration and discovery. Part 1: Cheese Sandwiches 2. Select “Sandwiches” 3. Select “Cheese” at the top 4. Use the arrows to enter the following under reactants on the left (“Before Reaction”): 8 pieces of bread 8 pieces of cheese 5. Stoichiometry is a collective term for the quantitative relationships between the masses, ... Converting amounts of substances to moles—and vice versa—is the key to all stoichiometry problems, whether the amounts are given in units of mass (grams or kilograms), weight (pounds or tons), or volume (liters or gallons). ... Answer. 86.2 g.

Figure 11.1.1 11.1. 1: Stoichiometry Map. 11.1: General Stoichiometry is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts. We have used balanced equations to set up ratios, in terms of moles of materials, that we can use as conversion factors to answer stoichiometric …Stoichiometry Practice Problems. This is a comprehensive, end-of-chapter set of practice problems on stoichiometry that covers balancing chemical equations, mole-ratio calculations, limiting reactants, and percent yield concepts. The links to the corresponding topics are given below. The Mole and Molar Mass.View Sandwich_Stoichiometry_PHET_modified (1).docx from CHEM 100 at Amador Valley High. Sandwich Stoichiometry Name _ Part I : Cheese Sandwiches • Go to the PhET simulation ... Organizational ambidexterity can be defined as the need to combine Group of answer choices local responsiveness and global integration exploration and …Institution. Chamberlain College Of Nursing. Gizmos Student Exploration Stoichiometry Answers Key. Avogadro’s number, balanced equation, cancel, coefficient, conversion factor, dimensional analysis, molar mass, mole, molecular mass, stoichiometry Activity A: Moles Get the Gizmo ready: Check that the equation is still: Fe2O3 + 3CO ...

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Castle Learning Online’s products don’t come with ready-made answer keys, but they do provide instant feedback and answers once the student has gone through an assignment.Balancing Equations and Simple Stoichiometry-KEY Balance the following equations: 1) 1 N 2 + 3 F 2 2 NF 3 2) 2 C 6 H 10 + 17 O 2 12 CO 2 + 10 H 2 O 3) 1 HBr + 1 KHCO 3 1 H 2 O + 1 KBr + 1 CO 2 4) 2 GaBr 3 + 3 Na 2 SO 3 ... and the reagent that leads to this answer is the limiting reagent. Both 4 Phet Sandwich Stoichiometry Lab Answer Key 2023-10-20 New Testament world. The first edition has been widely used in the classroom (over 30,000 copies sold). This updated edition, now with improved readability and narrative flow, will bring the social and political world of Jesus and his first followers to life for many more students of ... Use concrete everyday experiences (such as making sandwiches) to describe the what a limiting reactant means in chemical reactions. Identify the limiting reactant in a chemical reaction. Predict the products and …Sandwich Stoichiometry - Reaction Progress – GeoGebra. Check Details. Stoichiometry yield key chessmuseum. Stoichiometry worksheet with answersStoichiometry lesson plans & worksheets Basic stoichiometry phet lab answers / mole lab worksheets teachingStoichiometry worksheet answers. ... Unit 08 - …aqueous systems answers; introductory physical geography lab manual answers key; mad cowboy plain truth from the cattle rancher who wont eat meat by howard f mixed lyman 2001 08 02; 9th grade english odyssey stoichiometry answers; clinical trial methodology chapman and hall crc biostatistics series review; the united

Answer \(\ce{SiO2 + 3C \rightarrow SiC + 2CO}\) 4.50 kg SiO 2. Click here to see a video of the solutionThe term stoichiometry is derived from two Greek words: stoicheion (meaning "element") and metron (… The quantitative relationship among reactants and products is called stoichiometry. ... Step 3: Answer the question of what is being asked. The question asks how much H2(g) was produced. You are expected to solve for the …Basic Stoichiometry Phet Lab Homework Exercises Answers 3 3 In chemistry, reactions proceed with very specific recipes. The study of these recipes is stoichiometry...Basic Stoichiometry PhET Lab Let's make some sandwiches!B asic Stoichiometry PhET Lab rvsd 2/2011 Let's make some sandwiches! Introduction: When we bake/cook something, we use a ...Stoichiometry Lab. Stoichiometry February 28th‚ 2013 Abstract: The reactions of the Sodium Hydroxide and two acids‚ Hydrochloric Acid and Sulfuric Acid were performed. The heat given off by these two reactions was used to determine the stoichiometric ratio and the limiting reactants in each experiment. 4 Phet Sandwich Stoichiometry Lab Answer Key 2023-10-20 New Testament world. The first edition has been widely used in the classroom (over 30,000 copies sold). This updated edition, now with improved readability and narrative flow, will bring the social and political world of Jesus and his first followers to life for many more students of ... How many moles of water are produced when 57 moles of nitrogen are made? 3. Calculate the mass of aluminum oxide produced when 3.75 moles of aluminum burn in oxygen. Answers: 1A. 30 mol Ag 1B. 30 mol AgNO3. 1C. 20 mol H2O 1D. 10 mol NO. 2A. 38 mol N2H4 2B. 19 mol N2O4. 2C. 76 mol H2O. Stoichiometry Answer Key Vocabulary: Avogadro’s number, balanced equation, cancel, coefficient, conversion factor, dimensional analysis, molar mass, mole, molecular mass, stoichiometry Prior Knowledge Questions (Do these BEFORE using the Gizmo .) [Note: The purpose of these questions is to activate prior knowledge and get students thinking. …The coefficients for the two reactants (ingredients) are used to make a conversion factor between ham slices and pickles. Step 2: Solve. Since 5 pickles combine with 2 ham slices in each sandwich, 20 pickles are needed to fully combine with 8 ham slices. Step 3: Think about your result.Answer: 34 mol NH 3 3 mol H2__= 52 H 2 OR 34 mol NH 3 x 3 mol H2__= 52 H 2 2 mol NH 3 2 mol NH 3 Key Questions: 1. What was the given in the example above? 2. Where did the ଷ ௠௢௟ுమ ଶ ௠௢௟ேுయ, come from? 3. Double check to see if 52 moles of H 2 is the correct answer. SHOW the math below. What happened to Avogadro when ...Sandwich Stoichiometry Worksheet Answers. Try risk free form popularity basic stoichiometry phet lab answer key form get, create, make and sign sandwich. (1) h 2 s o 4 + n a o h → n a 2 s o 4 + h 2 o if it takes 27.4 ml of. One product = 2 bread + 1 cheese (to be filled in between the two breads) it is given that, after.Questions & Answers. This is an exploratory lab activity that introduces the conceptual understanding of stoichiometry and limiting/excess reactants. It starts by just building sandwiches with different ingredients and then …Answers: 1A. 30 mol Ag 1C. 20 mol H 2 O 2A. 38 mol N 2 H 4 2C. 76 mol H 2 O 1B. 30 mol AgNO 3 1D. 10 mol NO 2B. 19 mol N 2 O 4 3. 191 g Al 2 O 3

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The coefficients for the two reactants (ingredients) are used to make a conversion factor between ham slices and pickles. Step 2: Solve. Since 5 pickles combine with 2 ham slices in each sandwich, 20 pickles are needed to fully combine with 8 ham slices. Step 3: Think about your result. Gizmo Warm-up Just as a cook follows a recipe to decide how much of each ingredient to add, a chemist uses stoichiometry to determine the amounts of substances involved in chemical reactions. The Stoichiometry Gizmo™ allows you to try your hand at figuring out the amounts of reactants and products that take part in a chemical reaction. To begin, …Multiplying the number of moles of H A 2 SO A 4 by this factor gives us the number of moles of NaOH needed: 3.16 × 10 − 2 mol H 2 SO 4 × 2 mol NaOH 1 mol H 2 SO 4 = 6.32 × 10 − 2 mol NaOH. Notice how we wrote the mole ratio so that the moles of H A 2 SO A 4 cancel out, resulting in moles of NaOH as the final units.In today’s competitive job market, it is crucial to be well-prepared for interviews. One of the key aspects of interview preparation is crafting strong and effective answers that s...Everyday Stoichiometry. The quantitative relationship between reactants and products in a chemical reaction. Estimated3 minsto complete.answer key for basic stoichiometry phet lab - Bing WIN MOTOR PARTS. 2 2 Basic Stoichiometry Phet Lab Homework Exercises Answers 2022-09-16 Basic Stoichiometry Phet Lab Homework ... sandwiches!B asic Stoichiometry PhET Lab rvsd 2/2011 Let's make some sandwiches! Introduction: When we bake/cook something, we use a …Go to the PhET simulation website: https://phet.colorado.edu/sims/html/reactants-products-and …

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The Stoichiometry Gizmo™ allows you to try your hand at figuring out the amounts of reactants and products that take part in a chemical reaction. To begin, check that this equation is shown: Fe2O3 + 3CO 2Fe + 3CO2 1. Look at the coefficients (such as the “3” in 3CO) in front of each substanc. The coefficients for the two reactants (ingredients) are used to make a conversion factor between ham slices and pickles. Step 2: Solve. Since 5 pickles combine with 2 ham slices in each sandwich, 20 pickles are needed to fully combine with 8 ham slices. Step 3: Think about your result. Answers: 1A. 30 mol Ag 1C. 20 mol H 2 O 2A. 38 mol N 2 H 4 2C. 76 mol H 2 O 1B. 30 mol AgNO 3 1D. 10 mol NO 2B. 19 mol N 2 O 4 3. 191 g Al 2 O 3Go to the PhET simulation website: Sandwich Stoichiometry. Answer the following questions in the lab. Part 1: Cheese Sandwiches 2. Select "Sandwiches" 3. Select "Cheese" at the top 4. Use the arrows to enter the following under reactants on the left ("Before Reaction"): 8 pieces of bread 8 pieces of cheese 5.When it comes to finding the perfect pair of shoes, comfort is key. And for ladies who want both style and comfort, Hotter Shoes have become a top choice. But what sets Hotter Shoe...Create your own sandwich and then see how many sandwiches you can make with different amounts of ingredients. Do the same with chemical reactions. See how many products you can make with different amounts of reactants.4 Phet Sandwich Stoichiometry Lab Answer Key 2023-10-20 New Testament world. The first edition has been widely used in the classroom (over 30,000 copies sold). This updated edition, now with improved readability and narrative flow, will bring the social and political world of Jesus and his first followers to life for many more students of ...The Stoichiometry Gizmo™ allows you to try your hand at figuring out the amounts of reactants and products that take part in a chemical reaction. To begin, check that this equation is shown: Fe2O3 + 3CO 2Fe + 3CO2 1. Look at the coefficients (such as the “3” in 3CO) in front of each substanc.Sandwich Stoichiometry Answer Key Introduction to Soft Matter Ian W. Hamley 2013-03-18 This book provides an introduction to this exciting and relativelynew subject with chapters covering natural and synthetic polymers,colloids, surfactants and liquid crystals highlighting the many andvaried applications of these materials. 4 Phet Sandwich Stoichiometry Lab Answer Key 2023-10-20 New Testament world. The first edition has been widely used in the classroom (over 30,000 copies sold). This updated edition, now with improved readability and narrative flow, will bring the social and political world of Jesus and his first followers to life for many more students of ... Answer Key Chapter 12: Stoichiometry 12.1 Everyday Stoichiometry ... Answers 1. My new ham sandwich is composed of 2 slices of ham (H), a slice of cheese (C), ….

Chapter 9 Complete Stoichiometry Review Practice Problems with Answer Key.doc. Owner hidden. Dec 20, 2011. 57 KB.View PhET Sandwich Stoichiometry ch.docx from CHEMISTRY 1E03 at McMaster University. Sandwich Stoichiometry Part I : Cheese Sandwiches 1. Go to the PhET simulation: Reactants, Products & Leftovers. AI Homework Help. ... For question (1), answer both of the options below: 1a) Does it make sense to attempt to eliminate all pollution, or …I always use this lab before we actually discuss stoichiometry in class. This is great for Distance Learning! (But I use it during the regular school year). ★Digital Resource for Google Docs™★ Student Editable Lab Document (Google Doc™) Teacher Answer Key (Google Doc™) This activity is an excellent introduction to NGSS HS-PS1-7!Stoichiometry Worksheet #1 Answers 1. Given the following equation: 2 C 4H 10 + 13 O 2---> 8 CO 2 + 10 H 2O, show what the following molar ratios should be. a. C 4H 10 / O 2 b. O 2 / CO 2 c. O 2 / H 2O d. C 4H 10 / CO 2 e. C 4H 10 / H 2O 2. Given the following equation: 2 KClO 3---> 2 KCl + 3 O 2 a. How many moles of O 2 can be produced by ...Sandwich Stoichiometry - Reaction Progress – GeoGebra. Check Details. Stoichiometry yield key chessmuseum. Stoichiometry worksheet with answersStoichiometry lesson plans & worksheets Basic stoichiometry phet lab answers / mole lab worksheets teachingStoichiometry worksheet answers. Stoichiometry answersStoichiometry unit worksheet answer key ...No. Question Answer 1 Ammonium sulfate, an important fertilizer, can be prepared by the reaction of ammonia with sulfuric acid according to the equation: 2NH 3 (g) + H 2 SO 4 (l) (NH 4) 2 SO 4 (aq) Calculate the volume of NH 3 needed at 87 C and 300 kPa to react with 19.56 g of H 2 SO 4. 2 If 150 cm3 of carbon monoxide reacts with 150 cm3 of ...Stoichiometry Worksheet #1 Answers 1. Given the following equation: 2 C 4H 10 + 13 O 2---> 8 CO 2 + 10 H 2O, show what the following molar ratios should be. a. C 4H 10 / O 2 b. O 2 / CO 2 c. O 2 / H 2O d. C 4H 10 / CO 2 e. C 4H 10 / H 2O 2. Given the following equation: 2 KClO 3---> 2 KCl + 3 O 2 a. How many moles of O 2 can be produced by ...1. I don’t like pickles. What would my ideal ham sandwich be? 2. How does that change the equation? 3. Will this change affect the amounts of other materials? Answers. 1. My new … Sandwich stoichiometry answer key, Stoichiometry exercises mole equationsStoichiometry phet lab basic key answer sandwiches make name some answers introduction let text enter click homework questions pdf sheet Stoichiometry problems worksheet 1 answersUnit 8 stoichiometry worksheet 1 answers. ... Stoichiometry worksheet by leah's chemistry corner️ basic …, Feb 7, 2024 · Basic stoichiometry phet lab sandwiches make some text answer enter name click let introduction answers homework questions Phet build an atom worksheet answers — db-excel.com Phet isotopes and atomic mass worksheet answer key — db-excel.com. Phet Isotopes And Atomic Mass Worksheet Answer Key — db-excel.com Stoichiometry phet pdffiller ... , Please TURN IN C.7/C.10 worksheet Objectives: Determine the limiting reagent in a reaction. Calculate the percent yield of a product in a reaction Catalyst:., Basic stoichiometry phet lab sandwiches name some answers text enter let introduction questionsBasic stoichiometry phet lab answers / mole lab worksheets teaching Phet isotopes and atomic mass worksheet answer key — db-excel.comPhet worksheet isotopes atomic mass answers build atom key answer lab briefencounters elegant study resources excel ..., 4 Phet Sandwich Stoichiometry Lab Answer Key 2023-10-20 New Testament world. The first edition has been widely used in the classroom (over 30,000 copies sold). This updated edition, now with improved readability and narrative flow, will bring the social and political world of Jesus and his first followers to life for many more students of ... , Everyday Stoichiometry. The quantitative relationship between reactants and products in a chemical reaction. Estimated3 minsto complete., When it comes to finding the perfect pair of shoes, comfort is key. And for ladies who want both style and comfort, Hotter Shoes have become a top choice. But what sets Hotter Shoe..., Follow the step-by-step instructions listed below to eSign your sandwich stoichiometry worksheet answers: Choose the paper you want to sign and click the Upload button. Select My Signature. Select what type of eSignature to create. You can find 3 variants; a drawn, typed or uploaded eSignature., Stoichiometry exercises mole equationsStoichiometry phet lab basic key answer sandwiches make name some answers introduction let text enter click homework questions pdf sheet Stoichiometry problems worksheet 1 answersUnit 8 stoichiometry worksheet 1 answers. ... Stoichiometry worksheet by leah's chemistry corner️ basic …, The clue prompts them to solve a stoichiometry problem. The correct answer (round-able within 0.05) should be a whole number. That number is their next clue. The path is a loop that leads students through up to 30 stoichiometry problems. The scavenger hunt clues use mixed units (molecules, atoms, grams, moles and liters of a …, One can find the percentage of the mass of a compound that comes from each of the elements in the compound by using this equation: (number of atoms)(atomic weight) % element = (FW of the compound) x 100. Percent Composition. So the percentage of carbon in ethane is... (2)(12.0 amu), Suppose you need to make several sandwiches to take on a picnic with friends. You decide to make turkey-and-cheese sandwiches using the following “equation:”. 2 bread slices + 2 turkey slices + 1 lettuce leaf + 1 cheese slice 1 turkey-and-cheese sandwich This equation shows that you need those ingredients in a ratio of 2:2:1:1, respectively., Stoichiometry Answer Key Download File PDF Chapter 12 Stoichiometry Reading Guide Chapter 12 Stoichiometry Reading Guide Study Guide for Chapter 12 (Stoichiometry) p. 357 #2 p. 379 #61, 64, 69, 70, 73, 86, 88, 90 p. 877 Chapter 12 # …, Find free textbook answer keys online at textbook publisher websites. Many textbook publishers provide free answer keys for students and teachers. Students can also retrieve free t..., Stoichiometry 1 Worksheet and Key - Free download as PDF File (.pdf), Text File (.txt) or read online for free. 7l, Part 2: Meat and Cheese Sandwiches • Select “Sandwiches” • Select “Meat and Cheese” at the top • Use the arrows to enter the following under reactants on the left (“Before Reaction”): • 5 pieces of bread • 5 pieces of meat • 5 pieces of cheese • Fill in the number of products and leftovers under “After Reaction” in, 36 chemfiesta stoichiometry practice worksheet answersStoichiometry answer answers molarity mole chessmuseum kidsworksheetfun practices ️ basic stoichiometry phet lab answer key. reactants, products andStoichiometry phet lab basic key answer sandwiches make name some answers introduction let text enter click …, 1. Open the Sandwiches screen, then explore to create your own sandwiches and then see how many sandwiches you can make with different amounts of ingredients. Explain your understanding: 2. Predict (without using the sim) how many cheese sandwiches, as defined by the picture to the right, you can make if you have 6 pieces of bread and 4, Gas Stoichiometry Worksheet KEY - Free download as PDF File (.pdf) or read online for free. Gas stoichiometry, Answer. 2.04 mol . These examples illustrate the ease with which the amounts of substances involved in a chemical reaction of known stoichiometry may be related. ... Stoichiometric amounts of sandwich ingredients for this recipe are bread and cheese slices in a 2:1 ratio. Provided with 28 slices of bread and 11 slices of cheese, one …, 36 chemfiesta stoichiometry practice worksheet answersStoichiometry answer answers molarity mole chessmuseum kidsworksheetfun practices ️ basic stoichiometry phet lab answer key. reactants, products andStoichiometry phet lab basic key answer sandwiches make name some answers introduction let text enter click homework questions pdf sheet., 4 Phet Sandwich Stoichiometry Lab Answer Key 2023-10-20 New Testament world. The first edition has been widely used in the classroom (over 30,000 copies sold). This updated edition, now with improved readability and narrative flow, will bring the social and political world of Jesus and his first followers to life for many more students of ... , The answer key for the stoichiometry lab involving s'mores, which calculates the correct ratios and quantities of ingredients needed to make the perfect s'more. This key provides step-by-step instructions and explanations for students to understand the principles of stoichiometry and how it applies to this delicious treat., A stoichiometric quantity of chlorine gas is added to an aqueous solution of NaBr to produce an aqueous solution of sodium chloride and liquid bromine. Write the chemical equation for this reaction. Then assume an 89% yield and calculate the mass of chlorine given the following: 9.36 × 10 24 formula units of NaCl., The wick turns from a white string to black ash. The molecules in the candle. break down into CO2 and smoke. Candle wax and the wick will burn but the black ash, CO2 and smoke will not. Procedure: 1. Run the Reactants, Products and Leftovers PhET. You’ll start in the sandwich shop. Explore the Sandwich shop., Products Leftovers ----- # How many pieces of bread and how many pieces of cheese do you need to make exactly 3 sandwiches with no leftovers? _____ pieces of bread _____ pieces of cheese Part II : Meat and Cheese Sandwiches 1. Go to the PhET simulation website: Select “Sandwiches” 2., 4 Phet Sandwich Stoichiometry Lab Answer Key 2023-10-20 New Testament world. The first edition has been widely used in the classroom (over 30,000 copies sold). This updated edition, now with improved readability and narrative flow, will bring the social and political world of Jesus and his first followers to life for many more students of ..., Stoichiometry SECTION 3 PROBLEMS Write the answer on the line to the left. Show all your work in the space provided. 1. 88% The actual yield of a reaction is 22 g and the theoretical yield is 25 g. Calculate the percentage yield. 2. 6.0 mol of N 2 are mixed with 12.0 mol of H 2 according to the following equation: N, Converting amounts of substances to moles—and vice versa—is the key to all stoichiometry problems, whether the amounts are given in units of mass (grams or kilograms), weight (pounds or tons), or volume (liters or gallons). Figure \(\PageIndex{1}\): A Flowchart for Stoichiometric Calculations Involving Pure Substances., The job interview is a crucial step in the hiring process, as it allows employers to assess a candidate’s qualifications, skills, and fit for the role. One of the key elements that..., 11. Write down the amounts of the reactants and products you need to make water with no leftovers. Answers may vary! 2 2 1 2 0 0 12. Write down the amounts of reactants and products you need to make water with H2 OR O2 leftover. Answers may vary! 4 3 4 0 1 Try the other two chemical reactions (making ammonia and combusting methane). 13. , A stoichiometric quantity of chlorine gas is added to an aqueous solution of NaBr to produce an aqueous solution of sodium chloride and liquid bromine. Write the chemical equation for this reaction. Then assume an 89% yield and calculate the mass of chlorine given the following: 9.36 × 10 24 formula units of NaCl., Dec 14, 2016 ... This is a whiteboard animation tutorial of how to solve simple Stoichiometry problems. Stoichiometry ('stoichion' means element, ...