## What is the molar volume in van der Waals equation?

one mole

As Van der Waals’ equation applies only as an equation of state for gases the molar volume is a measure of the volume taken up by one mole of a gas, generally under non-standard conditions.

**How do you find molar volume at STP?**

At standard Temperature and Pressure (STP) the molar volume (Vm) is the volume occupied by one mole of a chemical element or a chemical compound. It can be calculated by dividing the molar mass (M) by mass density (ρ). Molar gas volume is one mole of any gas at a specific temperature and pressure has a fixed volume.

### What is A and B in van der Waals equation?

The constant ‘a’ gives the idea of the magnitude of attractive forces between the molecules of the gas and ‘b’ is the measure of effective volume occupied by the gas molecules in the van der Waals equation.

**What does the R in the van der Waals equation represents?**

The van der Waals Equation and P-V Isotherms where P is the pressure, V is the volume, R is the universal gas constant, and T is the absolute temperature.

## What is the value of molar volume of gas at STP?

22.4 L

Note that we have not specified the identity of the gas; we have specified only that the pressure is 1 atm and the temperature is 273 K. This makes for a very useful approximation: any gas at STP has a volume of 22.4 L per mole of gas; that is, the molar volume at STP is 22.4 L/mol (Figure 6.3 “Molar Volume”).

**What does A and B represent in van der Waals?**

### What is the value of Z when the gases can be compressed?

When Z=1, real gases get compressed easily.

**How do you find molar volume not at STP?**

If the conditions are not at STP, a molar volume of 22.4 L/mol is not applicable. However, if the conditions are not at STP, the combined gas law can be used to calculate the volume of the gas at STP; then the 22.4 L/mol molar volume can be used.

## What is the volume of these gases at STP?

The most common example is the molar volume of a gas at STP (Standard Temperature and Pressure), which is equal to 22.4 L for 1 mole of any ideal gas at a temperature equal to 273.15 K and a pressure equal to 1.00 atm.

**What is the molar volume of a gas at RTP?**

24 dm 3

One mole of any gas has a volume of 24 dm 3 or 24,000 cm 3 at rtp (room temperature and pressure). This volume is called the molar volume of a gas.