# Finding molecular formula from volume of products

• Ose90

#### Ose90

Hello sir and madam, I would be grateful if you can help me solve this question.

6.0 cm^3 of a gaseous hydrocarbon was sparked with 34.5 cm^3 of oxygen. The volume of the gaseous products after cooling to room temperature was 22.5 cm^3. The volume was reduced to 4.5 cm^3 on passing the gases through aqueous potassium hydroxide. What is the molecular formula of hydrocarbon?

my doubts : First, I try calculating the volume of CO2 produced and It is 18cm^3 and the volume of H2O is apparently 4.5 cm^3. What should I do next? How to find the volume of oxygen gas that has reacted? Should I convert them into moles by dividing the volume of room temperature? I'm confused :(

Sry I have posted this thread in the wrong section.

Thread should be closed, sorry moderator.

## What is a molecular formula?

A molecular formula is a representation of the number and type of atoms present in a molecule. It shows the actual number of each type of atom in a molecule, unlike an empirical formula which only shows the simplest whole number ratio of atoms.

## How do you find the molecular formula from the volume of products?

In order to find the molecular formula from the volume of products, you will need to know the molar ratios between the reactants and products in the chemical reaction. Once you have the molar ratios, you can use the ideal gas law to calculate the number of moles of each product and then convert that to the molecular formula based on the number and type of atoms present in the product.

## What is the ideal gas law?

The ideal gas law, also known as the general gas equation, is a mathematical formula that describes the behavior of an ideal gas under various conditions. It is written as PV=nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

## What factors can affect the accuracy of finding the molecular formula from volume of products?

The accuracy of finding the molecular formula from volume of products can be affected by a variety of factors, such as experimental errors, impurities in the reactants, incomplete reactions, and variations in temperature and pressure. It is important to ensure that all experimental conditions are controlled and accurate in order to obtain reliable results.

## Can the molecular formula be determined for any chemical reaction?

No, the molecular formula cannot be determined for every chemical reaction. Some reactions may not have a definite molecular formula, such as those involving complex molecules or mixtures of compounds. In addition, reactions involving substances that are not gases may not be suitable for using the ideal gas law to determine the molecular formula from volume of products.