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nexus9112 [7]
2 years ago
12

How many electrons are necessary to produce a charge of -0.90 c ?

Chemistry
1 answer:
yanalaym [24]2 years ago
4 0

One electron has a charge of -1.6* 10^-19 c

x electrons have a charge of -0.90 c


1/x = -1.6 * 10^-19 c / - 0.9 c cancel the c's. and the - signs.


1/x = 1.6 * 10^-19 / 0.9 Cross multiply

0.9 = 1.6 * 10^-19 x Divide by 1.6 * 10^-19

0.9 / 1.6 * 10^-19 = x

x = 5.625 * 10^18 electrons.

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Answer:

74.4 ml

Explanation:

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Given     15g = 15g/84g/mol = 0.1786mole Sodium Bicarbonate

From equation stoichiometry 3moles NaHCO₃ is needed for each mole citric acid or, moles of citric acid needed is 1/3 of moles sodium bicarbonate used.

Therefore, for complete reaction of 0.1786 mole NaHCO₃ one would need 1/3 of 0.1786 mole citric acid or 0.0595 mole H-citrate.

The question is now what volume of 0.8M H-citrate solution would contain 0.0595mole of the H-citrate? This can be determined from the equation defining molarity. That is => Molarity = moles solute / Liters of solution

=> Volume (Liters) = moles citric acid / Molarity of citric acid solution

=> Volume needed in liters = 0.0.0595 mole/0.80M = 0.0744 Liters or 74.4 ml

6 0
3 years ago
What is spectrophotometry? How can this be useful in identifying drugs?
liq [111]

Answer:

What is spectrophotometry? It is an analytic method that it use substances light absorbance property

How can this be useful in identifying drugs? It possible compare spectra and identify problem substance

Explanation:

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I hope I have been helpful

7 0
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What are the basic properties of the outer shell of an element?
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Hope this helps!!

7 0
3 years ago
If 0.600mol of chloride gas reacted with 0.500mol of aluminium metal to produce aluminium chloride,which reactant is in excess?h
Rus_ich [418]

Answer:

The balanced chemical equation: 2 Al + 3Cl2→ 2 AlCl3

Mole-mole relationship: 2 moles Al + 3 moles Cl2→ 2 moles AlCl3

Given: 0.600 moleCl2; 0.500 mole Al

Required: Excess reactant___; Number of moles of AlCl3 produced__

Solution: Use dimensional analysis using the mole-mole rel

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Based on the given:

0.6mole Cl2 + 0.4 mole Al ( this is possible based on the given)

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Answer: Excess reactant is Al; Limiting reactant is Cl2

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4 0
3 years ago
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It's a trick question because all of them contain both iconic and covalent bonds.

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4 0
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