University:
Montgomery College
Course:
CHEM 131: Principles of Chemistry I
Academic year:

2020
Views:

257

Pages:

2
Author:

96XGbl6o

Reaction Stoichiometry Grams of Substance A Grams of Substance B Molar mass of A Molar mass of B Use coefficients of A and B from balanced equation Moles of Substance A Moles of Substance B The coefficients in a balanced chemical equation specify the relative amounts in moles of each of the substances involved in the reaction. 2 C8H18 (l) + 25 O2(g)  16 CO2 (g) + 18 H2O(g) 2 mol C8H18 : 25 mol O2 : 16 mol CO2 : 18 mol H2O How many grams of glucose can be synthesized from 37.8 g of CO2 in photosynthesis? Given Find 6 CO2 + 6 H2O  C6H12O6+ 6 O2 37.8 g CO2 g C6H12O6 Conceptual Plan: Relationships: 1 mol C H O = 180.2g, 1 mol CO = 44.01g, 1 mol C H O : 6 mol CO 6 12 6 2 6 12 6 Solution: How many grams of O2 can be made from the decomposition of 100.0 g of PbO2? Given Find 2 PbO2 → 2 PbO + O2 100.0 g PbO2 g O2 Conceptual Plan: Relationships: Solution: 1 mol O2 = 32.00g, 1 mol PbO2 = 239.2g, 1 mol O2 : 2 mol PbO2 2 Practice Problems 1. How many grams of water produced in the oxidation of 1.00 g of glucose, C6H12O6? C6H12O6 (s) + 6 O2 (g) 1.00 g C6H12O6 6 CO2 (g) + 6 H2O (l) No direct (c) calculation 1 C6H12O6 180.0 C6H12O6 (a) mole C6H12O6 g H2O 18.0 g H2O 1 mol H2O 6 mol H2O 1 mol C6H12O6 (b) mole H2O 2. Automotive air bags inflate when sodium azide, NaN3, rapidly decomposes to its component elements; 2 NaN3 (s) 2 Na (s) + 3 N2 (g) (a) How many moles of N2 are produced by the decomposition of 1.50 mol of NaN3? (b) How many grams of NaN3 are required to form 10.0 g of nitrogen gas? References: Tro, Chemistry: A Molecular Approach 2nd ed., Pearson Brown/LeMay/Bursten, Chemistry: The Central Science, 12th ed., Pearson 2. (a) 2.25 mol N2; (b) 15.5 g NaN3 1. (a) 5.56 x 10-3 mol C6H12O6; (b) 3.33 x 10-3 mol H2O; (c) 0.600 g H2O Answers