Question

22.4L of hydrogen gas at STP contains how many molecules

Answer 1

1 mole

Step-by-step explanation:

At Standard Temperature and Pressure (273.15 Kelvin and 1 atmosphere), 22.4 L of gas is always equal to 1 mole.

We can use the Ideal Gas Equation to explain this:
`PV=nRT`

At STP, like noted above, the Pressure is 1 atmosphere (or 101,325 Pa) and 273.15 Kelvin. Using this information, we can determine that the Ideal Gas Constant, R, is 0.08206. We can now solve this equation.

`(1 atm)(22.4 L)=n(0.08206)(273.15)\\\\22.4 = n(22.4)\\\\(22.4)/(22.4) = (n(22.4))/(22.4)\\ \\ n = 1`