# What is the Empirical Formula of Vitamin B5 (Niacin)?

• Kelly09
In summary, an empirical formula is a simplified representation of the ratio of atoms in a molecule. It can be calculated by dividing the molar mass of each element by its molar mass and simplifying the resulting ratios. The difference between empirical and molecular formula is that the former shows the simplest ratio while the latter shows the exact number of atoms. However, they can be the same if the compound is already in its simplest form. The empirical formula is important in chemistry for identifying compounds, determining molecular formula, and predicting properties and behaviors.
Kelly09
Vitamin B5 is called niacin or nicotinic acid. Its percentage composition by mass is (58.4% Carbon) (4.09% Hydrogen) (25.99% Oxygen) and (11.38% Nitrogen). What is the empirical formula of vitamin B5?

Assume you have 100g of niacin. From your percentages, what mass of carbon, hydrogen, nitrogen and oxygen do you have? How many moles of each?

And Niacin is Vitamin B3, BTW. Minor mistake that won't really affect your problem.

## 1. What is an empirical formula?

An empirical formula is a representation of the relative number of each type of atom in a molecule. It shows the simplest whole-number ratio of the elements present in a compound.

## 2. How do you calculate the empirical formula?

The empirical formula can be calculated by dividing the molar mass of each element in a compound by its molar mass and then simplifying the resulting ratios to the smallest whole numbers.

## 3. What is the difference between empirical formula and molecular formula?

An empirical formula shows the simplest whole-number ratio of elements in a compound, while the molecular formula shows the exact number of each type of atom in a molecule.

## 4. Can an empirical formula be the same as a molecular formula?

Yes, if the compound is already in its simplest form, the empirical formula will be the same as the molecular formula.

## 5. Why is the empirical formula important in chemistry?

The empirical formula is important because it helps in identifying and characterizing compounds, determining their molecular formula, and predicting their properties and behaviors.

• Biology and Chemistry Homework Help
Replies
5
Views
3K
• Biology and Chemistry Homework Help
Replies
8
Views
3K
• Biology and Chemistry Homework Help
Replies
6
Views
4K
• Biology and Chemistry Homework Help
Replies
9
Views
13K
• Biology and Chemistry Homework Help
Replies
3
Views
2K
• Biology and Chemistry Homework Help
Replies
2
Views
13K
• Biology and Chemistry Homework Help
Replies
8
Views
5K
• Biology and Chemistry Homework Help
Replies
2
Views
4K
• Biology and Chemistry Homework Help
Replies
5
Views
6K
• Biology and Chemistry Homework Help
Replies
1
Views
3K