Question

1. which of the following represents a molecule with one carbon atom and two oxygen atoms? hco₃ c₂o₂ c₂o co₂ 6. how many sodium atoms are in each molecule of nahco₃? 2 5 3 1

Explanation:

Step1: Analyze the first question

The formula for a molecule with one carbon atom and two oxygen atoms is $CO_2$. $HCO_3$ has hydrogen in addition to carbon and oxygen, $C_2O_2$ has two carbon atoms, and $C_{20}$ has only carbon atoms.

Step2: Analyze the second question

In the formula $NaHCO_3$, the sub - script next to an element symbol indicates the number of atoms of that element in the molecule. Since there is no sub - script next to $Na$, it means there is 1 sodium atom.

Answer:

1. D. $CO_2$
2. D. 1