Question

what is the molar mass of cortisol (c₂₁h₃₀o₅), a steroid hormone produced in the human body by the adrenal gland?
○362.5 g/mol
○29.02 g/mol
○332.2 g/mol
○196.0 g/mol
○56.00 g/mol

Explanation:

Step1: Recall atomic masses

Atomic mass of C: $12.01$ g/mol, H: $1.008$ g/mol, O: $16.00$ g/mol.

Step2: Calculate for C

C atoms: $21\times12.01 = 252.21$ g/mol.

Step3: Calculate for H

H atoms: $30\times1.008 = 30.24$ g/mol.

Step4: Calculate for O

O atoms: $5\times16.00 = 80.00$ g/mol.

Step5: Sum all masses

Molar mass = $252.21 + 30.24 + 80.00 = 362.45 \approx 362.5$ g/mol.

Answer:

362.5 g/mol (the option with 362.5 g/mol)