Final answer:
The formula weight of NaHSO₄ is calculated by summing the atomic masses of each element and is found to be 120.08 amu, which is closest to the provided option C (120 amu).
Step-by-step explanation:
To calculate the formula weight of NaHSO₄, we need to sum the atomic masses of each constituent atom within the formula. We'll use atomic weights rounded to two decimal places.
- Na (Sodium) = 22.99 amu
- H (Hydrogen) = 1.01 amu
- S (Sulfur) = 32.07 amu
- O (Oxygen) = 16.00 amu × 4 (because there are four oxygen atoms)
Now, let's add these values together:
Na + H + S + 4O = 22.99 amu + 1.01 amu + 32.07 amu + (4 × 16.00 amu) = 120.08 amu.
Therefore, the closest answer from the options provided is 120 amu (Choice C).