Question

a) How many moles of folic acid (C₁₉H₁₉N₇O₆) are there in 246 micrograms?

b) How many oxygen atoms are in 246 micrograms of folic acid?

Answer 1

Answer 2

To calculate the number of moles of folic acid and the number of oxygen atoms in 246 micrograms of folic acid, we need to use the molar mass and the Avogadro's number.

a) Moles of Folic Acid (C19H19N7O6): The molar mass of folic acid (C19H19N7O6) can be calculated by summing the atomic masses of its constituent elements.

Molar mass of C = 12.01 g/mol Molar mass of H = 1.008 g/mol Molar mass of N = 14.01 g/mol Molar mass of O = 16.00 g/mol

Molar mass of folic acid (C19H19N7O6) = (19 * 12.01) + (19 * 1.008) + (7 * 14.01) + (6 * 16.00) g/mol

Molar mass of folic acid = 441.40 g/mol (rounded to 2 decimal places)

To find the number of moles, we can use the formula:

Moles = Mass / Molar mass

Moles of folic acid = 246 μg / (441.40 g/mol) * (1 mg / 1000 μg) * (1 mol / 1000 mg)

Moles of folic acid = 5.57 × 10^(-7) moles (rounded to 3 decimal places)

Therefore, there are approximately 5.57 × 10^(-7) moles of folic acid in 246 micrograms.

b) Number of Oxygen Atoms: In one molecule of folic acid (C19H19N7O6), there are 6 oxygen atoms.

To calculate the number of oxygen atoms in 246 micrograms of folic acid, we need to use the relationship between moles and atoms:

Number of oxygen atoms = Moles of folic acid * Avogadro's number * Number of oxygen atoms in one molecule

Number of oxygen atoms = 5.57 × 10^(-7) moles * 6.022 × 10^(23) atoms/mol * 6 atoms

Number of oxygen atoms = 2.01 × 10^(18) atoms

Therefore, there are approximately 2.01 × 10^(18) oxygen atoms in 246 micrograms of folic acid.