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Anastaziya [24]
3 years ago
6

Calculate the number of moles from the given number of particles. Express your answer to the correct number of significant figur

es.
There are moles in 1.26 × 1024 particles.
Chemistry
2 answers:
KengaRu [80]3 years ago
8 0

Answer: 2.09moles

Explanation:

One mole of an element contained 6.02*10^23 Particle

Xmol will contain 1.26*10^24 Particles

Xmol = 1.26*10^24/6.02*10^23

Xmol = 2.09moles

Ivan3 years ago
7 0

Answer:

The answer is 2.09 moles

Explanation:

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023 * 10²³ particles per mole. The Avogadro number applies to any substance.

Then you can apply a rule of three as follows: if 6.023*10²³ particles are contained in 1 mole, 1.26*10²⁴ particles in how many moles are they?

moles=\frac{1.26*10^{24} particles*1 mole}{6.023*10^{24} particles}

moles= 2.09

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Calculate the solubility of mn(oh)2 in grams per liter when buffered at ph=7.0. assume that buffer capacity is not exhausted
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When PH + POH = 14 
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when POH = -㏒[OH-]

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by using ICE table:

           Mn(OH)2(s) ⇄  Mn2+ (aq)  + 2OH-(aq)
initial                              0                     10^-7
change                           +X                      +2X
Equ                                 X                  (10^-7 + 2X)

when Ksp = [Mn2+][OH-]^2

when Ksp of Mn(OH)2 = 4.6 x 10^-14

by substitution:

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∴ X =2.3 x 10-5 M

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