Molar Volume and Gas Calculations
This page delves deeper into molar calculations, focusing on gases and their molar volume. It begins with an example problem calculating the number of molecules in a given number of moles of ammonia (NH3).
Example: To calculate the number of molecules in 0.34 moles of NH3, multiply 0.34 by Avogadro's number (6.02 × 10^23), resulting in approximately 2.05 × 10^23 molecules.
The concept of molar volume of gas under standard conditions is introduced. It is defined as the volume occupied by one mole of any gas at standard temperature and pressure (STP), which is 22.4 liters or dm³.
Definition: Molar volume of a gas is the volume occupied by one mole of the gas under standard conditions, equal to 22.4 dm³.
The page provides the formula for calculating the volume of a gas:
Volume (V) = number of moles (n) × molar volume (Vm)
An example problem demonstrates how to calculate the volume occupied by 3 moles of a gas under standard conditions.
Example: The volume occupied by 3 moles of a gas = 3 × 22.4 dm³ = 67.2 dm³.
The page also includes a problem involving the calculation of moles from a given mass of calcium carbonate (CaCO3), illustrating the practical application of molar mass concepts.
Highlight: Understanding molar volume is essential for solving problems related to gases in chemical reactions and industrial processes.