given the mass of a gas determine the moles. how do i do this?

Question

vocaloid · Answer

the molar mass = mass/mole
mass of gas = number of moles * molar mass

tfht · Answer

is it really that simple?

tfht · Answer

well what if you have $$2H _{2}(g)+O _{2}(g)\rightarrow 2H _{2}O (g)$$

tfht · Answer

@Vocaloid

vocaloid · Answer

@tfht: well, what exactly is the question asking?

vocaloid · Answer

@tfht: well, ok, my first explanation is how you convert mass of a gas to moles of that same gas

if you want to convert between two different gases, here's the general procedure:

1. convert the mass of gas to moles using the formula mass of gas = number of moles * molar mass
2. use stoichiometry to convert moles of gas A to gas B
3. use mass of gas = number of moles * molar mass again to find out the mass of gas B (if they ask for it)

(this general procedure applies for all reactions, not just gases)

I probably need to log off pretty soon but hopefully someone else can answer any other questions you have, ciao ~

tfht · Answer

thank you @Vocaloid