Question

Multiply H20, the formula with an odd number of oxygen atoms, by the smallest number which will make an even number of oxygen atoms

Answer 1

Answer: The number is 2.

Step-by-step explanation: The molecular formula of water is
`H_2O`. It contains two atoms of hydrogen and one atom of oxygen.

Thus there is an odd number of oxygen atom. To make the atoms even , with the smallest number, we multiply the formula by 2. The number of oxygen atoms in 2
`H_2O` will be 2 , which is an even number.