मुफ्त एन्थैल्पी परिवर्तन कैलकुलेटर
अभिक्रिया की एन्थैल्पी परिवर्तन (ΔH) निकालें। उत्पाद और अभिकर्मक दर्ज करें।
Pressure (Van der Waals)
24.0666 atm
Pressure (Van der Waals) vs Moles of Gas (n)
सूत्र
## Van der Waals Equation ### Formula **[P + a(n/V)²] × [V - nb] = nRT** Solving for P: **P = nRT/(V - nb) − a(n/V)²** Where: - **a** = correction for intermolecular attraction (L²·atm/mol²) - **b** = correction for molecular volume (L/mol) - Other variables as in the ideal gas law The a term reduces pressure (attraction pulls molecules inward). The b term reduces available volume.
हल किया गया उदाहरण
1 mol of N₂ (a = 1.36, b = 0.0318) at 300 K in 1 L.
- 01P = nRT/(V - nb) - a(n/V)²
- 02P = (1)(0.08206)(300)/(1 - 1×0.0318) - 1.36(1/1)²
- 03P = 24.618/0.9682 - 1.36
- 04P = 25.42 - 1.36
- 05P = 24.06 atm
अक्सर पूछे जाने वाले प्रश्न
What do the Van der Waals constants represent?
The constant a accounts for attractive forces between molecules (larger a = stronger attractions). The constant b accounts for the finite volume of molecules (larger b = bigger molecules).
Where do I find a and b values?
They are tabulated for common gases. For example, CO₂: a = 3.59, b = 0.0427; H₂O: a = 5.46, b = 0.0305.
When is the Van der Waals equation needed?
Use it at high pressures (above ~10 atm) or low temperatures where intermolecular forces become significant and ideal gas behavior breaks down.
सीखें