University:
Williams College
Course:
CHEM 201 | Organic Chemistry: Introductory Level
Academic year:

2024
Views:

346

Pages:

2
Author:

Noemi Torres

Chemistry Stoichiometry Problems – Set II 1. Translate the following word descriptions of reactions into balanced equations. (a) Ethylene gas, C2H4 burns in air to produce carbon dioxide and water.  (b) Iron reacts with chlorine gas to yield a white solid, iron (III) chloride.  3. The following questions refer to this reaction: Al4C3 + 12 F2  4 AlF3 + 3 CF4 (a) If in an experiment an ace chemistry student produces 2 moles of CF4, how many moles of F2 reacted? answer __________ mol F2 (b) In a second experiment an ace chemistry student reacts 28.8 g of Al4C3. How many moles of each product are produced? answer _________ mol AlF3 answer _________ mol CF4 (c) In a third experiment an ace chemistry student forgets to record the number of gram of reactants used in the reaction. At the end of the reaction he finds 8.4 g of AlF3 in the reaction vessel. How many grams of Al4C3 was used? answer _______ g Al4C3 2. Consider the following balanced equation: 4 Li + O2  2 Li2O (a) Maintain the basic mole ratios established by this balanced and complete the following data table using the one piece of given information. exp. 1 exp. 2 mol Li 0.2 mol O2 mol Li2O 5.0 exp. 3 1.2 (b) If 5 moles of lithium are reacted, how many grams of lithium oxide are made? 4. Consider the following reaction 4 NH3 + 3 O2  2 N2 + 6 H2O and answer the following questions: (a) If 0.5 mol of ammonia are reacted, how many moles of water are made? answer ___________ mol H2O (b) In another experiment an ace chemistry student reacts 6.8 g of NH3. How many grams of N2 are made? answer _________ g N2 (c) In a third experiment an ace chemistry student forgets to record the number of grams of reactants used in the reaction. At the end of the reaction he finds 10.8g of water in the reaction vessel. How many grams of NH3 were used? answer _________ g NH3