Question

What is the formula for 2 carbon molecules, 4 hydrogen molecules, and 2 oxygen molecules ?

Answer 1

CH3COOH

Step-by-step explanation:

It is ethanoic acid☺

Answer 2

`C_2 H_4 O_2` is the Molecular formula.

`CH_3 COOH` is the Chemical formula and its name is acetic acid or Ethanoic acid.

The number goes as subscript in the formula.

To find the number of atoms of each element we multiply coefficient × subscript

For example
`5 Ca_1 Cl_2` contains

5 × 1 = 5 , Ca atoms and

5 × 2 = 10, Cl atoms

If there is a bracket in the chemical formula

For example
`3Ca_3 (P_1 O_4 )_2` we multiply coefficient × subscript × number outside the bracket.......... to find the number of atoms (Please note: 3 is the coefficient, and if there is no number given then 1 will be the coefficient )

So 3 × 3 = 9, Ca atoms

3 × 1 × 2 = 6, P atoms

3 × 4 × 2 = 24, O atoms are present.