1. What is the Density Equation?

The density equation derived from the ideal gas law allows conversion from molecular weight to density. It calculates the density of an ideal gas given its molecular weight, pressure, and temperature.

2. How Does the Calculator Work?

The calculator uses the density equation:

Where:

• \( \rho \) — Density (g/cm³)
• \( MW \) — Molecular weight (g/mol)
• \( P \) — Pressure (atm)
• \( R \) — Gas constant = 0.0821 L·atm/(mol·K)
• \( T \) — Temperature (K)

Explanation: This equation is derived from the ideal gas law (PV = nRT) by substituting n = m/MW and ρ = m/V.

3. Importance of Density Calculation

Details: Density calculations are essential in chemistry, physics, and engineering for determining material properties, designing processes, and understanding gas behavior under different conditions.

4. Using the Calculator

Tips: Enter molecular weight in g/mol, pressure in atm, and temperature in Kelvin. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the ideal gas constant R?
A: The gas constant R is 0.0821 L·atm/(mol·K) when pressure is in atm and volume is in liters.

Q2: Is this equation valid for all gases?
A: This equation is most accurate for ideal gases at moderate temperatures and pressures. Real gases may deviate from this calculation.

Q3: How do I convert to different units?
A: Ensure all units are consistent. For different pressure or temperature units, convert them to atm and Kelvin first.

Q4: What temperature scale should I use?
A: The equation requires absolute temperature in Kelvin (K). Convert from Celsius using K = °C + 273.15.

Q5: Can I use this for liquid density?
A: No, this equation is specifically for ideal gases. Liquid density calculation requires different approaches.