Question

1. (nahco₃)₂ there are ____ atoms of sodium (na), __ atoms of hydrogen, __ atoms of carbon, and ____ atoms of oxygen

Explanation:

Step1: Analyze the formula (NaHCO₃)₂

The sub - script outside the parentheses multiplies all the atoms inside.

Step2: Calculate sodium atoms

For sodium (Na), there is 1 Na atom in NaHCO₃ and with the sub - script 2 outside the parentheses, the number of Na atoms is 2.

Step3: Calculate hydrogen atoms

There is 1 H atom in NaHCO₃, so with the sub - script 2, the number of H atoms is 2.

Step4: Calculate carbon atoms

There is 1 C atom in NaHCO₃, so with the sub - script 2, the number of C atoms is 2.

Step5: Calculate oxygen atoms

There are 3 O atoms in NaHCO₃, so with the sub - script 2, the number of O atoms is 3×2 = 6.

Answer:

2 atoms of sodium (Na), 2 atoms of hydrogen, 2 atoms of carbon, 6 atoms of oxygen