# How to determine the number of grams of hydrogen chloride produced by 1.5 L of hydrogen reacting with chlorine gas? I believe that the right formula is H2 + Cl2 = 2HCl. But I am stumped on how I...

How to determine the number of grams of hydrogen chloride produced by 1.5 L of hydrogen reacting with chlorine gas?

I believe that the right formula is H2 + Cl2 = 2HCl. But I am stumped on how I find the number of grams.

jerichorayel | Certified Educator

Your balanced chemical equation is correct. However, your question might not be written completely. There should be other given to solve for the amount of the hydrogen gas. Normally this kind of problem gives the states of the gas to be reacted; meaning, the pressure and temperature of the hydrogen gas should be provided.

If the pressure and temperature of the gas are provided, we can solve for the number of moles of hydrogen gas using the ideal gas equation since the volume of the gas is given:

`PV = nRT`

`n` = number of moles `= (PV)/(RT)`

**normally, this type of question is in STP or standard temperature and pressure (273.15 K and 1 atm)

Since we have the number of moles, we can solve the grams of hydrogen chloride produced. We can use this expression:

`mol es H_2 * (2 mol es HCl)/(1 mol e H_2) * (36.46 grams)/(1 mol e HCl)`