Question

What is the chemical formula of a carbohydrate?

Answer 1

The term carbohydrate can basically be translated into "carbon water".

Therefore, the typical formula for a carbohydrate is

$C{H}_{2}O\to$ Carbon with 2 Hydrogen and 1 Oxygen:

$C+H_{2}O$

The most common sugar is glucose from the photosynthesis reaction.

Glucose has a formula of $C_6{H}_{12}{O}_6$

Sucrose which is table sugar is $C_{12}{H}_{22}{O}_{11}$

Note that in each case the hydrogen is twice the oxygen, just the same as in a water molecule.