How do you calculate the pressure of hydrogen gas?
Table of Contents
How do you calculate the pressure of hydrogen gas?
Use the ideal gas equation (PV=nRT) to solve for pressure. n is the number of moles and R is the gas constant. It equals 0.082057 L atm / mol K. Therefore, you should convert your volume to liters (L).
How much energy does it take to compress hydrogen?
The theoretical energy to compress hydrogen isothermally from 20 bar to 350 bar (5,000 psi or ~35 MPa) is 1.05 kWh/kg H2 and only 1.36 kWh/kg H2 for 700 bar (10,000 psi or ~ 70 MPa). Greater compression energies are required to fill vehicles in practice due to compressor inefficiencies and heating during fast fills.
How do you calculate change in pressure?
d p d y = − ρ g . This equation tells us that the rate of change of pressure in a fluid is proportional to the density of the fluid. The solution of this equation depends upon whether the density ρ is constant or changes with depth; that is, the function ρ(y).
How do you calculate the partial pressure of the hydrogen gas?
Total moles = 0.500 + 0.250 = 0.750 mol. Total pressure = 98.8 kPa. Partial pressure of each gas is proportional to its mole fraction in the mixture. Therefore partial pressure of H2 = (0.500/0.750) x 98.8 = 65.9 kPa….
| Temp / K | P / mmHg | P / kPa |
|---|---|---|
| 298 | 23.8 | 3.17 |
| 300 | 26.8 | 3.57 |
How do you calculate the pressure of hydrogen gas produced in mmHg?
The resulting hydrogen gas is collected over water at 25°C, while the barometric pressure is 745.4 mmHg. What volume of wet hydrogen will be collected? pH2 = ptotal– pH2O = 754 mmHg – 23.8 mmHg = 721.6 mmHg….9.12: Dalton’s Law of Partial Pressures.
| Temperature(°C) | Vapor Pressure (mmHg) | Vapor Pressure (kPa) |
|---|---|---|
| 95 | 633.9 | 84.51 |
| 100 | 760.0 | 101.32 |
How much hydrogen is in a compressed gas cylinder?
Typically, the high weight of the cylinders or tubes limit the maximum hydrogen load that can be transported. A tube trailer with steel cylinders can store up to 25,000 liters of hydrogen compressed to 200 bar (Wystrach GmbH, 2017a), which amounts to around 420 kg of hydrogen.
How do you calculate the change in gas pressure?
Multiply the drop in pressure by the proportionality constant k to obtain the drop in temperature. For example, if a gas at an initial temperature of 300 K and an initial pressure of 100 Pa, drops by 50 Pa, the change in temperature = 150 K = (3 K/Pa) x (50 Pa) = (k) x (change in pressure).
How do you calculate gas collected over water?
Overview
- A gas produced in a chemical reaction can be collected by water displacement.
- Dalton’s law can be used to calculate the amount of the desired gas by subtracting the contribution of the water vapor.
How do you calculate gas over water?
A common way to determine the amount of gas present is by collecting it over water and measuring the height of displaced water; this is accomplished by placing a tube into an inverted bottle, the opening of which is immersed in a larger container of water.