17th October 2019

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# How many atoms are in the molecule of h20?

The smaller number is the number of atoms of the element to the left of it. No number means one atom. For CO2 there is one atom of carbon and two atoms of oxygen. For H2O, there is one atom of oxygen and two atoms of hydrogen.

Keeping this in view, how many molecules are in a glass of water?

A mole is defined as Avogadro's number of particles of any kind of substance (atoms, molecules, or ions). Avogadro's number is approximately 6.022 × 1023. Thus 18.01508 grams of water contain 6.022 × 1023 water molecules. A glass of water, or 200 grams of water, therefore contains 6.6855 × 1024 water molecules.

How many molecules are in a mole of water?

If you have a compound like H2O, then: one mole of water contains 6.02 x 1023 MOLECULES of water. But each molecule of water contains 2 H and 1 O atom = 3 atoms, so there are approximately 1.8 x 1024 atoms in a mole of water.

How many molecules are in a gallon of water?

A "mole" of water weighs about 18 grams and has ~6.02x10^23 molecules. There are 3785.4118 grams of water per gallon, so there are 3.22x10^-19 gallons in 41,000,000 molecules of water