Chapter 3 Chemical Reactions and Reaction Stoichiometry Problem 3.84 C52 of 54>

Question

Chapter 3 Chemical Reactions and Reaction Stoichiometry Problem 3.84 C52 of 54> Part A Conslants I Beriodkc Table Calculate the theoreical yield of CaH, CI when 128 g of Ca He reacts with 210 g of Cly, assuming that CzHs and Cly react only to form Ca Hs Cl and HCI When ethane (C2 Ha) reacts with chiorine (Cl) the main product is C2Hs Cl; but other products containing CI, such as CH Clh, are also obtained in small quantties The formation of these other products reduces the yield of CaHs C m200 Submit X Incorrect; Try Again; 3 attempts remaining Not quite Check through your caloulations, you may have made a rounding error or used the wrong number of significant figures Part B Calculate the percent yield of C2 HsCl if the reaction produces 163 g of CaHs C percent yield 90 ???w?3 Type here to search

Explanation / Answer

C2H6 + Cl2 ---------> C2H5Cl + HCl

no of moles of C2H6    = W/G.M.Wt

                                      = 128/30   = 4.26 moles

no of moles of Cl2     = W/G.M.Wt

                                  = 210/71   = 2.96 moles

1 mole of C2H6 react with 1 mole of Cl2

4.26 moles of C2H6 react with 4.26 moles of Cl2 is required.

Cl2 is limiting reactant

1 mole of Cl2 react with excess of C2H6 to gives 1 mole of C2H5Cl

2.96 moles of Cl2 react with excess of C2H6 to gives 2.96 moles of C2H5Cl

mass of C2H5Cl   = no of moels * gram molar mass

                             = 2.96*64.5   = 190.92g of C2H5Cl

Theoretical yield of C2H5Cl   = 190.92g

                              m = 190.92g >>>answer

percent yield   = actual yield*100/theoretical yield

                         = 163*100/190.92   = 85.4%   >>>answer

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