Using the periodic table, we can get the atomic
mass, which tells you how many grams of hydrogen
is in 1 mole. In this case, the periodic table
tells us there is 1g of hydrogen per mole.
We know that dihydrogen (H2) has 2
hydrogen atoms per molecule, so there will be 2 *
1g hydrogen per mole = 2g dihydrogen per mole.
If there are 2g dyhydrogen per mole, and we have
4g, then we know 4g / 2g per mole = 2 mole
dihydrogen in 4g.
To convert between moles and number of
molecules or atoms, you need to use Avogadro's
number, which is 6.02223, or 6 with
23 zeros. Avogadro's number tells you how many
particles there are per mole (there are
6.02223 particles in a mole), so
multiplying this number by the number of moles
will give you the number of particles. In this
case, multiplying by Avogadro's number will give
you the number of dihydrogen gas molecules.
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