Quite a few!
871 grams water (1 mole H2O/18.016 grams)(2 moles H/1 mole H2O)(6.022 X 1023/1 mole H)
= 5.82 X 1025 atoms of hydrogen
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6.6x1022 per gram of water
45,0 grams of hydrogen gas have 135,5.10e23 atoms.
3.05 x 1025
There are 2.22 grams of hydrogen in 25.0 grams of water.
To calculate the number of atoms in 3.4 grams of hydrogen peroxide, you first convert the grams to moles using the molar mass of hydrogen peroxide. Then, you use Avogadro's number to convert moles to atoms. There are approximately 6.022 x 10^23 atoms in 1 mole of a substance.