   # A 0523-g sample of the unknown compound C x H y was burned in air to give 1.612 g of CO 2 and 0.7425 g of H 2 O. A separate experiment gave a molar mass for C x H y of 114 g/mol Determine the empirical and molecular formulas for the hydrocarbon. ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

#### Solutions

Chapter
Section ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 4.4, Problem 2CYU
Textbook Problem
152 views

## A 0523-g sample of the unknown compound CxHy was burned in air to give 1.612 g of CO2 and 0.7425 g of H2O. A separate experiment gave a molar mass for CxHy of 114 g/mol Determine the empirical and molecular formulas for the hydrocarbon.

Interpretation Introduction

Interpretation:

The empirical and molecular formula for the unknown hydrocarbon CxHy should be determined.

Concept introduction:

• Empirical formula of a compound represents the smallest whole number relative ratio of elements in that compound.
• Equation for finding Molecular formula from the empirical formula,

MolarmassEmpiricalformula mass × Empirical formula

• The molar mass of an element or compound is the mass in grams of 1 mole of that substance, and it is expressed in the unit of grams per mol (g/mol).

### Explanation of Solution

From the given masses the amount of CO2andH2O can be calculated.

Thus, amount of CO2andH2O isolated from the combustion are,

1.612gCO2×1molCO244.010gCO2=0.03662molCO20.7425gH2O×1molH2O18.015gH2O=0.04121molH2O

For every mole of CO2 isolated, 1 mol of C must have been present in the unknown compound.

So,

0.03662molCO2×1molCinunknown1molCO2=0.03662molC

For every mole of H2O isolated, 2 mol of H must have been present in the unknown compound.

Therefore,

0.04121molH2O×2molHinunknown1molH2O=0

### Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

#### The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Find more solutions based on key concepts
Insufficient dietary protein can cause slowed protein synthesis. hepatitis. accelerated growth in children. all...

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

What are genomes?

Human Heredity: Principles and Issues (MindTap Course List)

Why is ketosis frequently accompanied by acidosis?

Chemistry for Today: General, Organic, and Biochemistry

List three reasons a breastfeeding mother may develop mastitis.

Nutrition Through the Life Cycle (MindTap Course List)

Why didnt ancient astronomers know of Uranuss existence?

Foundations of Astronomy (MindTap Course List)

Review. Oxygen at pressures much greater than 1 atm is toxic to lung cells. Assume a deep-sea diver breathes a ...

Physics for Scientists and Engineers, Technology Update (No access codes included)

Which planktonic primary producers can succeed at the greatest depths?

Oceanography: An Invitation To Marine Science, Loose-leaf Versin 