Which term is defined by the equation PV = nRT for gases?

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Multiple Choice

Which term is defined by the equation PV = nRT for gases?

Explanation:
This is about how a gas behaves when it follows a simple, idealized relationship between pressure, volume, amount, and temperature. PV = nRT ties these quantities together with the universal gas constant R, showing that pressure times volume depends on how much gas there is (n) and how hot it is (T). Because of this equation, increasing the temperature at constant n and P raises the volume, while compressing the gas (reducing V) at the same n and T raises the pressure. The constant R makes the units work out; with common units, R is 0.0821 L·atm·mol⁻¹·K⁻¹ or 8.314 J·mol⁻¹·K⁻¹, depending on whether you’re using liters-atmospheres or joules for energy. For example, 1 mole of an ideal gas at 25°C (298 K) and 1 atm would occupy about 24.5 L, since V = nRT/P. At standard temperature and pressure (STP), the molar volume is about 22.4 L per mole. The other terms listed are about standard conditions or acid–base definitions (STP describes conditions; Arrhenius acid and Brønsted–Lowry base describe how substances behave in reactions), not a gas-law equation.

This is about how a gas behaves when it follows a simple, idealized relationship between pressure, volume, amount, and temperature. PV = nRT ties these quantities together with the universal gas constant R, showing that pressure times volume depends on how much gas there is (n) and how hot it is (T).

Because of this equation, increasing the temperature at constant n and P raises the volume, while compressing the gas (reducing V) at the same n and T raises the pressure. The constant R makes the units work out; with common units, R is 0.0821 L·atm·mol⁻¹·K⁻¹ or 8.314 J·mol⁻¹·K⁻¹, depending on whether you’re using liters-atmospheres or joules for energy. For example, 1 mole of an ideal gas at 25°C (298 K) and 1 atm would occupy about 24.5 L, since V = nRT/P.

At standard temperature and pressure (STP), the molar volume is about 22.4 L per mole. The other terms listed are about standard conditions or acid–base definitions (STP describes conditions; Arrhenius acid and Brønsted–Lowry base describe how substances behave in reactions), not a gas-law equation.

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