moles_to_mass_practice

Name: Stoichiometry—Moles to Mass or Mass to Moles 1. The following equation is one way to prepare oxygen in a lab. 2KClO 3  2KCl + 3O 2 If 4.0 moles of KClO 3 are totally consumed, how many grams of oxygen gas would be produced? 2. Using the reaction from problem 1, if 25.6 g of KCl are produced, then how many moles of KClO 3 were consumed? 3. One of the reactions for rusting iron is as follows: 4Fe + 3O 2 2Fe 2 O 3 If 2.8 moles of iron rust completely, how many grams of iron (III) oxide are formed? 4. Using the reaction from problem 3, if 63.98 g of oxygen gas is completely consumed, how many moles of iron (III) oxide are formed? 5. In the reaction below, hydrogen peroxide decomposes to water. H 2 O 2 H 2 O + O 2 UNBALANCED! If 14.3 moles of H 2 O 2 decompose, how many grams of oxygen gas are produced? Name:

Stoichiometry—Moles to Moles (Review) Balance all equations, then perform the conversion (show your work). 1. Ca + O 2 CaO If you begin the reaction with 2.6 mol O 2 , how many mol Ca are used? 2. H 2 O 2 H 2 O + O 2 If you begin the reaction with 0.5 mol H 2 O 2 , how many mol O 2 are made? 3. BaCl 2 Ba + Cl 2 If 9.73 mol Ba are produced, how many mol BaCl 2 were used? 5. Na + H 2 O NaOH + H 2 If 0.03 mol NaOH are produced, how many mol H 2 O were used? 6. CuSO 4 + Al Al 2 (SO 4 ) 3 + Cu If 36.41 moles Al are consumed, how many mol CuSO 4 are used? 7. Cu + AgNO 3 Ag + Cu(NO 3 ) 2 If 0.0012 moles Cu are consumed, how many mol AgNO 3 are used? 8. BeF 2 + Mg MgF 2 + Be If 6.87 moles BeF 2 are consumed, how many mol MgF 2 are produced? 9. NaOH + FeCl 3 NaCl + Fe(OH) 3