How many moles of retinol(C20H30O)a form of vitamin A are in a 0.125g sample of retinol?

Answer 1

4.36×10−4mol

Dividing mass by molar mass yields number of moles. Using the chemical formula of retinol, the molar mass of retinol is found to be 286.459g/mol.

0.125g retinol×1mol retinol286.459g retinol=4.36×10−4mol retinol

Answer 2

To find the number of moles of retinol, we first need to calculate the molar mass of retinol by adding the atomic masses of its constituent elements. The molar mass of retinol is 286.45 g/mol. Next, we can use the formula n = m/M, where n is the number of moles, m is the mass of the sample (0.125 g), and M is the molar mass of retinol. Substituting these values gives us n = 0.125 g / 286.45 g/mol ≈ 4.37 x 10^-4 moles of retinol.