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OLEGan [10]
3 years ago
9

3. What measurement unit is used to measure molecules

Chemistry
2 answers:
lakkis [162]3 years ago
8 0

Answer: It is Mole.

Explanation:

Mole is the SI unit of measurement used to measure the number of things, usually atoms or molecules. One mole of something is equal to 6.02214078×1023 of same things (Avogadro's number).

zhannawk [14.2K]3 years ago
4 0
Mole is the SI unit of measurement used to measure
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A. Draw 2,3-dichloro octane.<br> b. Write the lewis structure for H20 molecule.
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4 years ago
If 43.7 g of iron is completely used to produce 62.5 g of iron (III) oxide, how many grams of oxygen are involved in the reactio
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Mass of Oxygen : 18.8 g

<h3>Further explanation</h3>

Reaction(balanced) :

4Fe + 3O₂ → 2Fe₂O₃

mass Fe = 43.7 g

mol Fe(MW= 55,845 g/mol) :

\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{43.7}{55.845}\\\\mol=0.783

mol O₂ : mol Fe = 3 : 4, so mol O₂ :

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Mass O₂(MW=32 g/mol) :

\tt mass=mol\times MW\\\\mass=0.5873\times 32\\\\mass=18.7936~g\approx 18.8

Or simply you can Conservation of mass, where the masses before and after the reaction are the same

<em>mass reactants=mass products</em>

mass iron+mass oxygen=mass  iron (III) oxide

43.7 g + mass oxygen=62.5 g

mass oxygen = 62.5 - 43.7 = 18.8 g

5 0
3 years ago
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