Final answer:
The mass of a 7.508-mol sample of sodium hydroxide (NaOH) is 300.03 g.
Step-by-step explanation:
To determine the mass of a 7.508-mol sample of sodium hydroxide (NaOH), we need to use the molar mass of NaOH. The molar mass of NaOH can be calculated by adding up the atomic masses of its constituent elements: Na (22.990 g/mol), O (15.999 g/mol), and H (1.008 g/mol).
Molar mass of NaOH = (1 x 22.990 g/mol) + (1 x 15.999 g/mol) + (1 x 1.008 g/mol) = 39.997 g/mol
Now, we can calculate the mass of the sample:
Mass of NaOH sample = Number of moles x Molar mass = 7.508 mol x 39.997 g/mol = 300.03 g