A Sample of Hydrogen Gas at STP
The Properties of Hydrogen Gas at STP
Hydrogen is a chemical element with the symbol H and atomic number 1. It is the lightest and most abundant element in the universe, primarily found in stars and gas giants. In its molecular form, hydrogen exists as H2 gas, which is colorless, odorless, and highly flammable. Hydrogen gas has various applications in industry, such as hydrogen fuel cells for producing electricity.
STP Conditions
STP stands for standard temperature and pressure, which is defined as a temperature of 0 degrees Celsius (273.15 Kelvin) and a pressure of 1 atmosphere (101.3 kPa). At STP, gases behave ideally and can be used to calculate their properties accurately.
Calculating the Moles of Hydrogen Gas
In the given scenario, a sample of hydrogen gas occupies 50.4 L at STP. To determine the number of moles of hydrogen atoms in the sample, we can use the ideal gas law equation:
PV = nRT
Where:
P = Pressure (1 atm)
V = Volume (50.4 L)
n = Number of moles
R = Ideal gas constant (0.0821 L.atm/mol.K)
T = Temperature (273.15 K)
Calculation
Using the ideal gas law equation, we can rearrange it to solve for the number of moles:
n = PV / RT
n = (1 atm * 50.4 L) / (0.0821 L.atm/mol.K * 273.15 K)
n = 4.5 moles
Conclusion
Therefore, the sample of hydrogen gas at STP contains approximately 4.5 moles of hydrogen atoms. This calculation helps us understand the amount of hydrogen present in the given volume under standard conditions.
A sample of hydrogen gas occupies 50.4 L at STP. This sample contains how many moles of hydrogen atoms? 4.5