I knew the answer but i do not know how i got it!! please help.. i Chrome File E

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I knew the answer but i do not know how i got it!! please help..

i Chrome File Edit View History Bookmarks People Window Help 65% L- Tue 12:16 AM MasteringChemistry: Post Lecture Homework Chapter 09 https://session.masteringchemistry.com/myct/itemiView?assignmentProblemiD-88342286 Home I Central Michi Secure × à Secure https:/ . What Will Run Out First? Rosourcs Che « previous | 8 of 9 next » 1,10.4 What Will Run Out First? Submit My Answers Give Up Post ne Learning Goal Correct To identify the limiting reactant and use it to calculate the amount of product. Get a fast The balanced equation is P, (s) + 10C12 (g)->4PQ (g) As you begin to work limiting reactant problems, let us first consider an example that you might encounter at home. Imagine that it is lunch time and you need to make a total of four turkey sandwiches for you and your friends. The 'formula for making a turkey sandwich cal s for two slices of bread, two slices of turkey, and one slice of cheese. To make the four sandwiches, you will need eight slices of bread, eight slices of turkey, and four slices of cheese. HOW IT Calculations involving a limiting reactant Now consider a situation in which 26.0 g of Pa is added to 56.0 g of Cl, and a chemical reaction occurs. To identify the limiting reactant, you will need to perform two separate calculations: Get a 1. Calculate the number of moles of PCls that can be produced from 26.0 g of P4 (and 2. Calculate the number of moles of PCl5 that can be produced from 56.0 g of Cl2 (and Then, compare the two values. The reactant that produces the smaller amount of product is the Post up excess Ch). excess P4). When you go to the refrigerator and gather all of the ingredients, you discover that you only have seven slices of bread instead of the eight that you need. You have plenty of the rest of the ingredients. Since you dont have enough bread to make all four sandwiches, the bread is considered to be the limiting reactant. A limiting reactant will determine how much product, in this case the sandwich, you can make. It is the reactant, or ingredient, that is present in the smallest amount when you take into consideration the ratio of reactants. The rest of the ingredients are considered to be excess reactants, meaning you have more than is necessary amount of ingredients you have and the formula* you will be able to make three and one-half sandwiches. You will use all of the bread and wil have leftover turkey and cheese. imiting reactant. Part B How many moles of PC, can be produced from 26.0 g of P4 (and excess Cl)? Express your answer to three significant figures and include the appropriate units. Hints this Based on the 0.839 mole Submit MyAnswer Give Up Correct

Explanation / Answer

P4(s) + 10 Cl2(g) -----> 4PCl5 (g)

1 mole of P4 produces 4 moles of PCl5

1* 124 g og P4 produces 4 * (31+(5*35.5)) g of PCl5

26 g of P4 produces 834/124 * 26 g of PCl5

                  = 174.871 g of PCl5

10 moles of Cl2 produces 4 moles of PCl5

10 * 71 g of Cl2 produces 4 * (31+(5*35.5)) g of PCl5

56 g of Cl2 produces 834/(10*71)*56 g of PCl5

                   = 65.78 g of PCl5

so Cl2 is limiting reagent.

Number of moles of PCl5 formed = 65.78/(31+(5*35.5)) = 0.3155 moles with Limiting reagent as Cl2

number of moles of PCl5 when 26 g of P4 is used = 174.871/(31+(5*35.5)) = 0.8387 moles.

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