to get the answer, take the mass you have divide by the molecular mass of the compound which in water's case happens to be 18g.
18g x 1mol/18g = 1 mole or 6.022x1023 molecules of H2O
if you mean demineralized water ( 100% H2O ) then :
molar mass of water is around 18 g/mol so there is 1 mol of water
number of H2O molecules = 6.02 * 10^23 * 1 = 6.02*10^23
in each molecule there is 2 hydrogen atoms so we multiply by 2
number of atoms of hydrogen = 6.02*10^23*2 = 1.24*10^24
Before answering this question, recall two things. 1) We will need to find the molar mass of water. 2) We know that Avogadro's number (6.022 X 1023) is atoms or molecules per mole.
The molar mass of H20: (1.01 X 2) + (16.00) = 18.02 grams/mol
Start with what you're given.
18 g H20 X (1 mol H2O / 18.02 g H2O) X (6.022 X 1023 molecules H2O / 1 mol H2O)
= 6.022 X 1023 molecules of H2O or 6.0 X 1023 if significant figures count in your class
Atomic Mass hydrogen = 1.01
Formula- grams × (6.02 × 1023) / atomic mass = number of atoms
18 grams H × (6.02 × 1023) / 1.01 grams = 107.29 × 1023 atoms of hydrogen
Normal oxygen has atomic mass 16, hydrogen 1, water has 1 oxygen and 2 hydrogen, so the total molecular mass of water is 18. Therefore, we are talking about one mole of water. This mole of water has 6 x 1023 atoms of oxygen, twice as many atoms of hydrogen.
18 grams water (1 mole H2O/18.016 grams)(2 mole H/1 mole H2O)(6.022 X 1023/1 mole H)
= 1.2 X 1024 atoms of hydrogen
=======================
18x6.6x1022
10.8x10/24
6.6x1022 per gram of water
45,0 grams of hydrogen gas have 135,5.10e23 atoms.
1,204428358.1023 atoms of hydrogen
3.05 x 1025
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 ========================
6.6x1022 per gram of water
45,0 grams of hydrogen gas have 135,5.10e23 atoms.
1,204428358.1023 atoms of hydrogen
1,25 grams of CH4 contain 0,156696.10e23 atoms.
1 third because water is composed by 2 oxygen atoms and 1 of hidrogen, so 207÷3=69 grams.
3.05 x 1025
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 ========================
there are 2 atoms of hydrogen in water
2 hydrogen atoms per molecule of water.
3.65 grams of water is equal to .203 moles of H2O. This means there is also .203 moles of H2 present, or .408 grams.
H2OCount two atoms hydrogen in one molecule of water.
Quite a few! 738 grams water (1 mole H2O/18.016 grams)(2 mole H/1 mole H2O)(6.022 X 10^23/1 mole H) = 4.93 X 10^25 atoms of hydrogen