Chapter 3 -lecture 5

Chapter 3 -lecture 5 - General Chemistry I Fall 2007 Joann...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: General Chemistry I Fall 2007 Joann S. Monko Chemistry 9th ed. Raymond Chang Try this …no really, try this! Zn + 2 AgCl ZnCl 2 + 2 Ag Start with 10.30 g Zn & actually produce 27.51 g Ag 1. What is the theoretical yield of silver? 2. What is the % yield for silver? 3. How many grams of AgCl was needed to complete the reaction? 4. How many grams of Zn actually reacted and how many grams are “left-over”? 5. How many grams of zinc chloride was produced as a biproduct? LIMITING REACTANT LIMITING REACTANT In a given reaction, there is not enough of one reagent to use up the other reagent completely. The reagent in short supply LIMITS the quantity of product that can be formed. Kotz &Treichel Chemistry & Chemical Reactivity 5th ed. Limiting Reactant 6 Green 12 Red 6 molecules formed 6 red left over Chemistry, 8th ed. Chang LIMITING REACTANTS LIMITING REACTANTS R eactants eactants Products Products 2 NO (g) + O 2 (g) 2 NO 2 (g) Limiting reactant = ___________ Excess reactant = ____________ Kotz &Treichel Chemistry & Chemical Reactivity 5th ed. Rxn 1: Balloon inflates fully, some Zn left Rxn 1: Balloon inflates fully, some Zn left * * More than enough Zn to use up the 0.100 mol HCl More than enough Zn to use up the 0.100 mol HCl * * HCl = limiting reagent HCl = limiting reagent Rxn 2: Balloon inflates fully, no Zn left Rxn 2: Balloon inflates fully, no Zn left * Right amount of each (HCl and Zn) * Right amount of each (HCl and Zn) Rxn 3: Balloon does not inflate fully, no Zn left. Rxn 3: Balloon does not inflate fully, no Zn left. * Not enough Zn to use up 0.100 mol HCl * Not enough Zn to use up 0.100 mol HCl *Zn = limiting reagent *Zn = limiting reagent LIMITING REACTANTS LIMITING REACTANTS React Zn React Zn (s) (s) with 0.100 mol HCl with 0.100 mol HCl (aq) (aq) Zn + 2 HCl ---> ZnCl Zn + 2 HCl ---> ZnCl 2 + H + H 2 1 2 3 Kotz &Treichel Chemistry & Chemical Reactivity 5th ed. RXTN 1 RXTN 2 RXTN 3 Mass Zn (g) 7.00 3.27 1.31 Mole Zn 0.107 0.050 0.020 Mole HCl 0.100 0.100 0.100 mol HCl / mol Zn 0.93/1 2.00/1 5.00/1 Limiting Reactant HCl none Zn LIMITING REACTANTS LIMITING REACTANTS React Zn React Zn (s) (s) with 0.100 mol HCl with 0.100 mol HCl (aq) (aq) Zn + 2 HCl ---> ZnCl Zn + 2 HCl ---> ZnCl 2 + H + H 2 2 Kotz &Treichel Chemistry & Chemical Reactivity 5th ed. Ca 3 P 2 (s) + 6 H 2 O (l)--> 3 Ca(OH) 2 (s) + 2 PH 3 (g) A reaction started with 7.39 g of solid calcium phosphide and 2.00 g water . 1.08 g of phosphorous trihydride gas was collected. Solid calcium hydroxide was removed during purification. 1. What is the theoretical yield – 100% reacted? 1. What is the percent yield? 1. How many grams of calcium hydroxide were removed? Kotz &Treichel Chemistry & Chemical Reactivity 5th ed. 7.39 g 2.00 g actual yield = 1.08 g 1. What is the theoretical yield of PH 3 ?...
View Full Document

{[ snackBarMessage ]}

Page1 / 31

Chapter 3 -lecture 5 - General Chemistry I Fall 2007 Joann...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online