There are two atoms of oxygen in the molecule.
One of carbon and two of oxygen to get CO2.
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The number between two numbers is commonly called the average of those two numbers. The average can be computed with this formula: (a + b) / 2. The average of 0.3 and 0.33 is (0.3 + 0.33) / 2 = 0.63 / 2 = 0.315
They are called a rational number.
Assuming you're talking about the chemical formula for water (H2O) - It means that for every atom of Oxygen (O) there are two atoms of Hydrogen (H)
They are called the factors.
A COMPOUND number. e.g. 24 , 1,2,3,4,6,8,12,24 are all factors of '24'. NB A number that has no factors is a PRIME Number. e.g. 3,5,7,