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Stella [2.4K]
4 years ago
5

A chemist weighed out 19.9 g of aluminum. Calculate the number of moles of aluminum she weighed out.

Chemistry
1 answer:
vodomira [7]4 years ago
3 0
Aluminum is 26.982 grams per mole, so 26.982/19.9 will give you the moles 1.3558794
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Vitamin C contains the elements C, H, and O. It is known to contain 40.9% C and 4.58% H by mass. The molar mass of vitamin C has
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C₆H₈O₆

Explanation:

First off, the<u> percent of oxygen by mass</u> of vitamin C is:

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Now we <u>convert each of those masses to moles</u>, using the <em>elements' respective atomic mass</em>:

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  • O ⇒ 98.136 g ÷ 16 g/mol = 6.134 mol O ≅ 6 mol O

So the molecular formula for vitamin C is C₆H₈O₆

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