How many moles of hydrogen gas are present at STP if you have 0.200 L of hydrogen gas?

Answer 1

Hello, Jade,

There exists a very useful conversion factor for gasses at STP. It states that 1 mole of any fgas will occupy 22.4 liters. Any gas. At STP. It is initially hard to believe it's true, but it is a very handy number to memorize.

Use it as a conversion factor:

22.4 liters/mole

In this case, 0.200 liters of H₂ at STP would represent:

(0.200 liters H₂)/(22.4 liters H₂/mole) = 0.00893 moles H₂

Bob