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The formula for calculating gas volume at STP is V = nRT/P, where V is volume, n is moles, R is the gas constant, T is temperature, and P is pressure.

In more detail, the formula V = nRT/P is known as the ideal gas law. It is used to calculate the volume of a gas at standard temperature and pressure (STP). In this equation, 'V' stands for volume, 'n' is the number of moles of gas, 'R' is the gas constant, 'T' is the temperature in Kelvin, and 'P' is the pressure.

STP is a standard set of conditions for measuring gases, defined as 0 degrees Celsius (273.15 Kelvin) and 1 atmosphere of pressure. The gas constant 'R' is typically given the value of 0.0821 L·atm/(K·mol) when using these units.

To use this formula, you first need to know the number of moles of gas, the temperature and the pressure. If you're working at STP, you can use the standard values for temperature and pressure. Then, you simply substitute these values into the formula and solve for 'V' to find the volume.

Remember, it's important to ensure that all your units match when using this formula. For example, if your pressure is given in atmospheres, your volume will be in litres. If your pressure is given in Pascals, your volume will be in cubic metres.

This formula is a fundamental part of gas laws in chemistry and is very useful for understanding how gases behave under different conditions. It's a key tool in your chemistry toolkit, so make sure you're comfortable with how to use it!

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