#2-28: Percent Composition, Empirical Formula, and Molecular Formula:

Last updated 7 months ago

10 questions

Note from the author:

Directions:
Round all percent composition answers to one after the decimal. If you use percent composition to find empirical formula, you may want to keep a few more decimal places. 

Instructions

Directions:
Round all percent composition answers to one after the decimal. If you use percent composition to find empirical formula, you may want to keep a few more decimal places. 

#2-28: Percent Composition, Empirical Formula, and Molecular Formula:

Last updated 7 months ago

10 questions

Note from the author:

Directions:
Round all percent composition answers to one after the decimal. If you use percent composition to find empirical formula, you may want to keep a few more decimal places. 

Instructions

Directions:
Round all percent composition answers to one after the decimal. If you use percent composition to find empirical formula, you may want to keep a few more decimal places. 

Strychnine, a rat poison, has the following chemical formula:

C21H22N2O2

Fill in the percent composition for each of the elements in this compound:
_______ % Carbon
_______ % Hydrogen
_______ % Nitrogen
_______ % Oxygen

You are responsible for determining an unknown over-the-counter drug substance. In the lab, you ran a test to determine that the unknown drug sample contained the following percent composition:

00% Carbon
48% Hydrogen
53% Oxygen

What is the empirical formula?

Identify the drug sample:

Caffeine contains the following percent composition:

5% Carbon
15% Hydrogen
9% Nitrogen
5% Oxygen

What is the empirical formula?

If the molecular mass is approximately 195.0 g/mol.

What is the molecular formula?

Aspartame, an artificial sweetener, contains the following:

762 moles Carbon
160 moles Hydrogen
680 moles Nitrogen
699 moles Oxygen

Fill in the percent composition for each of the elements in this compound:
_______ % Carbon
_______ % Hydrogen
_______ % Nitrogen
_______ % Oxygen

Determine the empirical formula:

Nitroglycerine is a compound that is used in heart medications. It can also be used in explosives! 

A 40.0-gram sample of Nitroglycerine contains:
6.348 grams Carbon
0.864 grams Hydrogen
7.260 grams Nitrogen
25.364 grams Oxygen

Fill in the percent composition for each of the elements in this compound:

_______ % Carbon
_______ % Hydrogen
_______ % Nitrogen
_______ % Oxygen

#2-28: Percent Composition, Empirical Formula, and Molecular Formula:

#2-28: Percent Composition, Empirical Formula, and Molecular Formula:

C21H22N2O2

What is the empirical formula?

Identify the drug sample:

What is the empirical formula?

If the molecular mass is approximately 195.0 g/mol.

What is the molecular formula?

Determine the empirical formula:

Determine the empirical formula:

If the molecular mass is approximately 227.0 g/mol.

What is the molecular formula?

C21H22N2O2

What is the empirical formula?

Identify the drug sample:

What is the empirical formula?

If the molecular mass is approximately 195.0 g/mol.

What is the molecular formula?

Determine the empirical formula:

Determine the empirical formula:

If the molecular mass is approximately 227.0 g/mol.

What is the molecular formula?

#2-28: Percent Composition, Empirical Formula, and Molecular Formula:

#2-28: Percent Composition, Empirical Formula, and Molecular Formula:

C21H22N2O2

What is the empirical formula?

Identify the drug sample:

What is the empirical formula?

If the molecular mass is approximately 195.0 g/mol.What is the molecular formula?

Determine the empirical formula:

Determine the empirical formula:

If the molecular mass is approximately 227.0 g/mol.What is the molecular formula?

C21H22N2O2

What is the empirical formula?

Identify the drug sample:

What is the empirical formula?

If the molecular mass is approximately 195.0 g/mol.What is the molecular formula?

Determine the empirical formula:

Determine the empirical formula:

If the molecular mass is approximately 227.0 g/mol.What is the molecular formula?

If the molecular mass is approximately 195.0 g/mol.

What is the molecular formula?

If the molecular mass is approximately 227.0 g/mol.

What is the molecular formula?

If the molecular mass is approximately 195.0 g/mol.

What is the molecular formula?

If the molecular mass is approximately 227.0 g/mol.

What is the molecular formula?