Problem: Ascorbic acid (vitamin C) contains 40.92% carbon, 4.58% hydrogen, and 54.50% oxygen by mass. Assume a 100-g sample of ascorbic acid.How many moles of carbon, hydrogen, and oxygen are present in a 100-g sample of ascorbic acid?

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We’re being asked to calculate the number of moles of carbon, hydrogen, and oxygen in a 100-g sample of ascorbic acid.


We are given the mass % of each. 

Recall the mass percent formula:

% mass=mass componenttotal mass×100


Let's first determine the mass of carbon (C), hydrogen (H), and oxygen (O).

Given: 100-g ascorbic acid sample

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Problem Details

Ascorbic acid (vitamin C) contains 40.92% carbon, 4.58% hydrogen, and 54.50% oxygen by mass. Assume a 100-g sample of ascorbic acid.

How many moles of carbon, hydrogen, and oxygen are present in a 100-g sample of ascorbic acid?

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