Question

the equation below represents a chemical reaction that occurs in plant cells.
6co₂ + 6h₂o $xrightarrowchlorophyll{sunlight}$ c₆h₁₂o₆ + 6o₂
carbon dioxide water carbohydrate oxygen
how many atoms are represented in the reactants of this equation?
o 6
o 12
o 24
o 36

Explanation:

Step1: Analyze carbon - dioxide atoms

In $6CO_2$, each $CO_2$ has 1 carbon and 2 oxygen atoms. So in $6CO_2$, the number of atoms is $6\times(1 + 2)=18$.

Step2: Analyze water atoms

In $6H_2O$, each $H_2O$ has 2 hydrogen and 1 oxygen atom. So in $6H_2O$, the number of atoms is $6\times(2 + 1)=18$.

Step3: Calculate total atoms in reactants

Add the number of atoms from $6CO_2$ and $6H_2O$. $18+18 = 36$.

Answer:

36