If i have 21 grams of hydrogen, how many atoms of hydrogen do i have?
There are 6.023 x 10^23 atoms in 1 gram of hydrogen. So how many are in 21 g hydrogen?
To find the number of hydrogen atoms in 21 grams of hydrogen, you need to use Avogadro's number, which states that there are approximately 6.023 x 10^23 atoms in 1 mole of any substance.
First, convert the grams of hydrogen to moles. The molar mass of hydrogen is approximately 1.008 grams/mol. So, divide the given mass, 21 grams, by the molar mass:
21 g / 1.008 g/mol ≈ 20.833 mol
Next, multiply the number of moles by Avogadro's number to find the number of atoms:
20.833 mol x (6.023 x 10^23 atoms/mol) ≈ 1.254 x 10^25 atoms
Therefore, you have approximately 1.254 x 10^25 atoms of hydrogen in 21 grams.