# If 3.00 moles of #H_2O# are produced, how many grams of hydrogen gas are used?

##### 1 Answer

If the equation is

and if you balance it,

Assume that:

n = number of moles

m = mass of substance

M = molar mass (equivalent to atomic weight on the periodic table)

The mole ratio between

So, if 1 mole of

then 3.00 moles of

You now know that Hydrogen gas has 6.00 moles. (n)

Your next step is to find the molar mass (M) of hydrogen (

Since you have found your number of moles (n) and molar mass (M) for hydrogen, your final step is to determine the mass (m).

Looking back at the

The mass of hydrogen gas is:

m = 1.00 g/mol

Therefore 6.00 grams of hydrogen gas is being used.