If an element contributes more than one atom to the molecule, use the mass of the total number of atoms for the element, not just one. So water is 11.2% hydrogen and 88.8% oxygen by mass.

For oxygen:

1. mass % O = (mass of 1 mol of oxygen/mass of 1 mol of CO2) x 100.
2. mass % O = (32.00 g / 44.01 g) x 100.
3. mass % O = 72.71 %

94.07 percent

Hydrogen peroxide is a highly concentrated source of oxygen; 1 ml of 30 per cent (100 vol) solution contains enough oxygen to saturate more than 1.5 1. of venous blood (assuming 14.6 g per 100 ml haemoglobin and a venous oxygen content of 14 ml per 100 ml of blood).

88.89%

54.50%

52.12%

21 percent

Avogadro’s number is defined as the number of elementary particles (molecules, atoms, compounds, etc.) per mole of a substance. It is equal to 6.022×1023 mol-1 and is expressed as the symbol NA. Avogadro’s number is a similar concept to that of a dozen or a gross.

To convert between mass and number of moles, you can use the molar mass of the substance. Then, you can use Avogadro’s number to convert the number of moles to number of atoms.

197.0 amu

We now know that a hydrogen atom has a mass of 1.6735 x 10-24 grams, and that the oxygen atom has a mass of 2.6561 X 10-23 grams. As we saw earlier, it is convenient to use a reference unit when dealing with such small numbers: the atomic mass unit.

It will help you. How many atoms of gold of (196.97 g/mol) are in a gold nugget with a mass of 4.25g, and there are answer is 1.30⋅10^22 with molecules or atoms of gold.

Question: How Many Atoms Are In 4.20 Moles Of Gold? (1 Mole = 6.02 X 1023 Atoms). 2.53 X 10 To The Power 24 Atoms None 4.2 X 10 To The Power 23 Atoms 6.02 X 10 To The Power 23 Atoms.

To calculate the number of atoms in a sample, divide its weight in grams by the amu atomic mass from the periodic table, then multiply the result by Avogadro’s number: 6.02 x 10^23.

By looking at a periodic table, we can conclude that the molar mass of the element lithium is 6.94g, the molar mass of zinc is 65.38g, and the molar mass of gold is 196.97g. Each of these quantities contains 6.022×1023 atoms of that particular element. The units for molar mass are grams per mole or g/mol.

One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule of oxygen contains two oxygen atoms.

It’s true that Oxygen, can be termed as O . But one oxygen atom cant exist on its own, because its unstable. Usually any atom needs 8 electrons in its outer orbit in order to stay stable. So, it makes a bond with another oxygen atom and shares 2 electrons each and becomes stable.

Oxygen is a chemical element – a substance that contains only one type of atom. Its official chemical symbol is O, and its atomic number is 8, which means that an oxygen atom has eight protons in its nucleus.

Oxygen is available as O2 not as O because pure oxygen is highly reactive it will combine with anything to form oxides,disconnected atoms have a very strong tendency to form bonds. So if there is nothing else available for oxygen atom to combine it will combine with another oxygen atom to form an oxygen molecule.