In a chemical reaction, you collect 500 ml of hydrogen gas at stp how many moles of hydrogen gas did you collect?

Stp represents the standard temperatures and pressure (temp of 273 kelvin and pressure of 1 atm). At s. t. p one mole of a gas occupies a volume of 22400 Cm3 or ml. Therefore, we can determine the number of moles of hydrogen gas that will occupy a volume of 500 ml.

number of moles = 500 ml : 22400 ml = 0.02232 moles.

Therefore, the number of moles equivalent to a volume of 500 ml of hydrogen are 0.02232 moles.