18 gram water means 1 mole H2O. There are 2 hydrogen atoms and 1 oxygen atom in H2O. In 1 mole H2O there are 6. 023×10^23 atoms. So one mole of water contains 6. 022×10^23 number of water molecules. We know that every water molecule is made up of two hydrogens and one oxygen which means that every water molecule contains 3 atoms. So, to get number of atoms in 18g of water, we will multiply Avogadro's number by 3. Thus, there are 3. 35 * 10^22 molecules of water in 1 gram. Now, each molecule of water has 2 hydrogen atoms and 1 oxygen atom. This means that there are 3 atoms in each molecule. Therefore, there will be 6. 022×1023 oxygen atoms in 1 mole, or 18 g of water. Assuming the Water is pure, 10g of water contains approximately 3. 33*10^23 water molecules (via conversion to moles of water, and multiplying it by Avagadro's number), multiply this by another 3 (since every water molecule contains 3 atoms, 2 hydrogen and 1 oxygen), leaving us with 10^24 atoms in total.
For H2O, there is one atom of oxygen and two atoms of hydrogen. A molecule can be made of only one type of atom. In its stable molecular form, oxygen exists as two atoms and is written O2. to distinguish it from an atom of oxygen O, or ozone, a molecule of three oxygen atoms, O3.
A mass in grams numerically equal to the molecular weight contains one mole of molecules, which is known to be 6. 02 x 10^23 (Avogadro's number). So if you have x grams of a substance, and the molecular weight is y, then the number of moles n = x/y and the number of molecules = n multiplied by Avogadro's number.
If we have one mole of water, then we know that it will have a mass of 2 grams (for 2 moles of H atoms) + 16 grams (for one mole O atom) = 18 grams.
Scientists estimate there are 1080 atoms in the universe. Since we can't go out and count each particle, the number of atoms in the universe is an estimate. It is a calculated value and not just some random, made-up number.
There are 6. 022 × 1023 atoms of potassium in every mole of potassium. Since one mole of KOH contains one mole of K, the answer is 6. 022×1023 atoms of K.
Under standard conditions nitrogen is a colorless, tasteless, odorless gas. It forms diatomic molecules, which means that there are two nitrogen atoms per molecule in nitrogen gas (N2).
So, 2 moles of water (36 grams) contain "2 x 2 x 6 x 10^23 = 2. 4 x 10^24 atoms of hydrogen.
Avogadro's number is a very important relationship to remember: 1 mole = 6. 022×1023 6. 022 × 10 23 atoms, molecules, protons, etc. To convert from moles to atoms, multiply the molar amount by Avogadro's number. To convert from atoms to moles, divide the atom amount by Avogadro's number (or multiply by its reciprocal).
This requires 100/18 moles of hydrogen. As the molar mass of hydrogen is 2, it requires 200/18 = 100/9 g of hydrogen. It requires 100/9 g of hydrogen gas and 800/9 g of oxygen gas to make 100 g of water.
One sulfuric (H2SO4) molecule has 2 hydrogen atoms, 1 sulfur atom, and 4 oxygen atoms. You can also say one mole of sulfuric acid has two mols of hydrogen atoms, 1 mol of sulfur atoms, and 4 moles of oxygen atoms. So in total, we have 7 mols of atoms. But that's in 1 mol of sulfuric acid.
A mole of oxygen molecules contains 2 moles of oxygen atoms. For elements that exist as molecules, it is best to explicitly state whether molecules or atoms are meant. Thus "1 mole of oxygen molecules" means 6. 022 x 1023 O2 molecules, or 2 x 6. 022 x 1023 O atoms; "1 mole of oxygen atoms" means 6. 022 x 1023 O atoms.