Molecular Formula Calculation: From CH2O to Molecular Formula

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Questions and Answers

What is the purpose of an empirical formula?

To depict how atoms are bonded in a compound

To determine the molecular mass of a compound

To show the elements present in a compound (correct)

To calculate the number of atoms in a molecule

Which type of bond information is NOT provided by a structural formula?

Ionic bond (correct)

Double covalent bond

Single covalent bond

Triple covalent bond

How is the formula mass different from the molecular mass?

Formula mass shows the exact number of atoms, while molecular mass doesn't

Formula mass includes all types of bonds, while molecular mass only includes covalent bonds

Formula mass is the mass of one formula unit, while molecular mass is the mass of one molecule (correct)

Formula mass is for ionic compounds, while molecular mass is for covalent compounds

Which formula would be most helpful in determining the number of atoms in a molecule?

Molecular formula Signup and view all the answers

If a compound has the empirical formula CH2O, what could be its molecular formula?

C2H4O2 Signup and view all the answers

What is the empirical formula of the compound that contains 40.9% C, 4.58% H, and 54.51% O by mass?

CH2O Signup and view all the answers

In the compound with 30.43% N and 69.57% O by mass, what is the molecular formula?

N2O4 Signup and view all the answers

If a compound has a molecular weight of 180 g/mol and contains 40.0% C, 6.6% H, and 53.4% O, what is its molecular formula?

C6H12O6 Signup and view all the answers

What is the empirical formula for a compound that consists of 49.5% C, 5.20% H, 28.8% N, and 16.5% O by mass?

C3H5NO Signup and view all the answers

Determine the molecular formula for a compound with a molecular weight of 194.1 g/mol and an empirical formula of CH2O.

(CH2O)2 Signup and view all the answers

A compound comprises 92 g/mol with 30.43% N and 69.57% O by mass. What is its empirical formula?

NO2 Signup and view all the answers

What is the empirical formula defined as?

The formula with the smallest possible whole numbers of elements Signup and view all the answers

How does the percent composition of a compound relate to its empirical formula?

Percent composition leads to the determination of the empirical formula Signup and view all the answers

In the compound containing 25.93% nitrogen and 74.07% oxygen, what is the empirical formula?

NO3 Signup and view all the answers

What does stoichiometry deal with in chemistry?

Chemical reactions Signup and view all the answers

What information does the molecular formula provide about a compound?

It shows the simplest ratio of atoms in a compound Signup and view all the answers

How are subscripts represented in an empirical formula?

As integers Signup and view all the answers

Study Notes

Stoichiometry

Branch of chemistry that deals with quantitative laws of chemical combination
Concerned with measurements based on chemical combination

Empirical Formula

Simplest formula for a compound, defined as the ratio of subscripts of the smallest possible whole number of elements present
Also known as the simplest formula
Gives information about the ratio of numbers of atoms in a compound
Can be determined from percent composition of a compound

Examples of Empirical Formula

PtCl2N2H6 (Cisplatin) from 65.0% Pt, 23.6% Cl, 9.35% N, and 2.05% H by mass
NO3 from 25.93% N and 74.07% O
C4H5N2O from 49.5% C, 5.20% H, 28.8% N, and 16.5% O by mass
CH2O from 40.0% C, 6.6% H, and 53.4% O by mass
NO2 from 30.43% N and 69.57% O