Ascorbic acid, or vitamin C (C6H8O6), is an essential vitamin. It cannot be stored by the body and must be present in the diet. What is the molar mass of ascorbic acid? Vitamin C tablets are taken as a dietary supplement. Ifa typical tablet contains 500.0 mg vitamin C, what amount (moles) and what number of molecules of vitamin C does it contain?

Subject:
Chemistry
Author:
charlie2
Created:
1 year ago

Answers 1

Answer:

The molar mass of vitamin C is 176.12 g/mol.

The number of moles in 500.0 mg vitamin C is 2.84x10^-3 mol

The number of moles in 500.0 mg vitamin C is 1.71x10^21 molecules

Explanation:

Determine the molar mass

The chemical formula for vitamin C is C6H8O6

The molar mass of C6H8O6: The atomic mass of C is 12.01 g/mol , H is 1.008 g/mol and O is 16.00 g/mol. We multiply each atomic mass by the number present in the chemical formula and then add them together to get the molar mass. The molar mass of C6H8O6 then is:

C6H8O6 6 C × 12.01 g/mol C = 72.06 g/mol

8 H × 1.008 g/mol H = 8.064 g/mol

6 O × 16.00 g/mol O = 96.00 g/mol

Sum = 176.124 g/mol

Calculate the number of moles

Given:

mass = 500.0 mg

molar mass = 176.12 g/mol

Solve for number of moles

500 mg * 10^-3 g / 1 mg * 1 mol / 176.12 g = 2.84x10^-3 mol

Calculate the number of molecules

Given:

moles = 2.84x10-3 mol

Avogadro's number = 6.022x1023 molecules

Solve for number of molecules

2.84x10^-3 mol (6.022x10^23 molecules/ 1 mol) = 1.71x10^21 molecules

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