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Asked Feb 27, 2020
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Folic Acid (C19 H19 N7 O6), also known as vitamin B9 is used to treat anemia caused by folic acid deficiency. Folic acid is also used as a supplement by women during pregnancy to reduce the risk of neural tube defects (NTDs) in the baby. The molar mass of a folic acid 441.4g/mol.

a.) How many moles of vitamin B9 are present in 25 mg of sample?
b.) How many oxygen atoms are there in 0.25 mol of vitamin B9?
c.) What is the mass percent of carbon in vitamin B9? (up to 3 sig. figures)

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Step 1

a) The number of moles of Vitamin B9 can be calculated as given below.

Chemistry homework question answer, step 1, image 1

Therefore, the number of moles of Vitamin B9 is 5.66 × 10-5 mol.

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