Ch.12 - SolutionsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: An unknown compound shows an elemental analysis of 40% C, 6.7% H and 53.3% O. When 289.418 g of the unknown compound is dissolved in 1.8 L of water, the freezing point of the solution is lowered by 3.32oC. Assuming that the compound is a nonvolatile, calculate its molar mass and its molecular formula. The freezing point constant, Kf, of water is 1.86 oC/m. 

Problem

An unknown compound shows an elemental analysis of 40% C, 6.7% H and 53.3% O. When 289.418 g of the unknown compound is dissolved in 1.8 L of water, the freezing point of the solution is lowered by 3.32oC. Assuming that the compound is a nonvolatile, calculate its molar mass and its molecular formula. The freezing point constant, Kf, of water is 1.86 oC/m.