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KIM [24]
3 years ago
10

Why is refraction so important in eyeglasses.

Chemistry
1 answer:
miss Akunina [59]3 years ago
7 0
It helps our eyes to see better. For example: If you can't read a book because you see that is blurry, you might need glasses to see it much clearer
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If 4000 g of Fe2O3 reacts, how many moles of CO are needed?<br> (add work)
7nadin3 [17]

Answer:

75.15 mol.

Explanation:

  • Firstly, we need to write the balanced equation of the reaction:

<em>Fe₂O₃ + 3CO → 2Fe + 3CO₂.</em>

It is clear that 1.0 mole of Fe₂O₃ reacts with 3.0 moles of CO to produce 2.0 moles of Fe and 3.0 moles of CO₂.

∴ Fe₂O₃ reacts with CO with (1: 3) molar ratio.

  • we need to calculate the no. of moles of (4000 g) of Fe₂O₃:

<em>no. of moles of Fe₂O₃ = mass/molar mass</em> = (4000 g)/(159.69 g/mol) = <em>25.05 mol.</em>

<u>Using cross multiplication:</u>

1.0 mole of Fe₂O₃ needs → 3.0 moles of CO,

∴ 25.05 mole of Fe₂O₃ needs → ??? moles of CO.

<em>∴ The no. of moles of CO needed</em> = (3.0 mol)(25.05 mol)/(1.0 mol) =<em> 75.15 mol.</em>

5 0
4 years ago
How many grams of H2O2 are in 3 moles of H2O2?
stira [4]

Answer:

The answer is 102.3!

Explanation:

you get this by multiplying 34.1 x 3 to get 102.3.

Wondering why you multiply 34.1 times 3?

WELLLLLLLLLLL...

when you get 1 mole of h202, you get 34.1 so if you ask for 3 moles of H202, you get 102.3!

4 0
2 years ago
How many elements in this compound: HClO<br> 1<br> 2<br> 3<br> 4
spayn [35]
There are three elements hydrogen, chlorine, and oxygen
3 0
3 years ago
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Please help me thanks so much?!?!?.:;)))) I will mark you:))
Pepsi [2]

Answer:

D)

Explanation:

6 0
3 years ago
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Write a balanced equation: 34
Schach [20]
Fe2(SO4)3 + 6KOH -> 3K2SO4 + 2Fe(OH)3
7 0
3 years ago
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