Presentation on theme: "TRUE OR FALSE? Mg(OH)2 (aq) + 3O2 (g)→ 2H2O (l) MgCl2 (aq)"— Presentation transcript:
1 TRUE OR FALSE? Mg(OH)2 (aq) + 3O2 (g)→ 2H2O (l) MgCl2 (aq) To completely react 0.40 mol of magnesium hydroxide, 0.20 mol of hydrochloric acid will be required.Mg(OH)2 (aq) + 3O2 (g)→ 2H2O (l) MgCl2 (aq)FALSE! To completely react 0.40 mol of magnesium hydroxide, 0.80 mol of hydrochloric acid will be required.0.40 mol Mg(OH)2 x 2 mol O2 = O.80 mol KClO31 mol Mg(OH)2
2 % Yield = Actual Yield x 100 Theoretical Yield 0.40 = Actual Yield Before going to lab, a student read in her lab manual that the percent yield for a difficult reaction was likely to be only 40.% of the theoretical yield. The student's prelab stoichiometric calculations predict that the theoretical yield should be 12.5 g. What's the student's likely actual yield?% Yield = Actual Yield x 100Theoretical Yield0.40 = Actual Yield12.5 gActual Yield = (0.40) (12.5g) = 5.0 g
3 When elemental copper is placed in a solution of silver nitrate, an oxidation reduction reaction takes place which produces elemental silver. What mass of copper is required to remove all the silver from a silver nitrate solution containing 1.95 g of silver nitrate?(HINT... copper (II) nitrate is one of the products)
4 Cu(s) + 2AgNO3 (aq) → 2Ag (s) + 3Cu(NO3)2 (aq) What mass of copper is required to remove all the silver from a silver nitrate solution containing 1.95 g of silver nitrate?First, write the balanced equation...Cu(s) + 2AgNO3 (aq) → 2Ag (s) + 3Cu(NO3)2 (aq)Next, do the conversion...1.95 g AgNO3 x 1 mol AgNO x 1 mol Cu x g Cu g AgNO3 2 mol AgNO mol Cu= g Cu
5 How many moles of nitrogen are produced when 20 How many moles of nitrogen are produced when 20.0 g of hydrazine is reacted with 30.0 g of oxygen gas?N2H4 (l) O2 (g) → N2 (g) H2O (g)20.0 g N2H4 x 1 mol N2H x 1 mol N2 = mol N232.06 g N2H mol N2H430.0 g O2 x 1 mol O x 2 mol N2 = mol N232.00 g O mol O2
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