How to find the Molecular Formula of a Chemical Compound

This video tutorial explains how to calculate the molecular formula from the empirical formula. It emphasizes the importance of understanding the relationship between molecular and empirical formulas, and provides a step-by-step guide to performing the calculations. The tutorial includes two examples: one with NO2 and another with C2H3O, demonstrating how to determine the molecular formula by comparing molar masses and adjusting subscripts accordingly.

Why is it important to calculate molecular formulas from empirical formulas in chemistry?

• To determine the exact number of atoms in a molecule

• To find the color of a compound

• To measure the temperature of a reaction

• To calculate the speed of a chemical reaction

What is the first step in calculating the molecular formula from the empirical formula?

• Measuring the temperature of the reaction

• Comparing the molecular molar mass to the empirical molar mass

• Calculating the speed of the reaction

• Finding the color of the compound

If the ratio of molecular molar mass to empirical molar mass is 3, what does this indicate?

• The empirical formula is incorrect

• The compound is unstable

• The molecular formula has three times the number of atoms as the empirical formula

• The molecular formula is the same as the empirical formula

In the example with the empirical formula NO2 and molar mass 92.02g/mol, what is the molecular formula?

• NO2

• NO

• N2O4

• N3O6

For the compound with empirical formula C2H3O and molar mass 172g/mol, what is the molecular formula?

• C6H9O3

• C8H12O4

• C4H6O2

• C2H3O