17. What is the major element per mass in NaOH?

A. Oxygen
End of exam
B. Hydrogen
C. Sodium
D. All elements contribute the same mass.

Look up the atomic masses and compare those numbers although the "per mass" is confusing.

I would go with C. Sodium

its c

To determine the major element per mass in NaOH, we need to calculate the molar masses of each element present in NaOH and compare them.

First, let's break down NaOH into its constituent elements:

- Na represents sodium
- O represents oxygen
- H represents hydrogen

The molar mass of each element is as follows:

- Sodium (Na) = 22.99 g/mol
- Oxygen (O) = 16.00 g/mol
- Hydrogen (H) = 1.01 g/mol

Next, we calculate the total molar mass of NaOH by adding the molar masses of each element:

NaOH = (1 x Na) + (1 x O) + (1 x H) = 22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 40.00 g/mol

Now, we can determine the percentage of each element in NaOH by calculating the mass contribution of each element and comparing it to the total molar mass:

- Sodium (Na) = (22.99 g/mol / 40.00 g/mol) x 100% ≈ 57.48%
- Oxygen (O) = (16.00 g/mol / 40.00 g/mol) x 100% ≈ 40.00%
- Hydrogen (H) = (1.01 g/mol / 40.00 g/mol) x 100% ≈ 2.52%

From the calculations, we can see that the major element per mass in NaOH is sodium (Na) because it contributes approximately 57.48% of the total molar mass.

Therefore, the correct answer is option C. Sodium