The value of universal gas constant (R) depends on — States of Matter and Gaseous State Chemistry Question

💡 Solution & Explanation

# Universal Gas Constant (R) The universal gas constant is a **fundamental constant** that does not depend on any variable or condition. **Why C is correct:** The value of $R$ is **independent of pressure, volume, temperature, amount of gas, or any other variable**. It is a true universal constant with a fixed value: $$R = 8.314 \, \text{J mol}^{-1} \text{K}^{-1} = 0.0821 \, \text{L atm mol}^{-1} \text{K}^{-1}$$ This constant appears in the ideal gas equation $PV = nRT$ and remains the same regardless of which gas or conditions you're studying. **Why other options are wrong:** - If A = pressure, B = volume, or C = temperature: $R$ does **not vary** with any of these - If D = amount of gas: $R$ is **molar** (per mole), so it's independent of the amount - Any option suggesting $R$ depends on conditions would be incorrect **Conclusion:** $R$ depends on **nothing**—it is a universal constant by definition.