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konstantin123 [22]
2 years ago
8

How many moles is 8.72x10^24 atoms? can you solve the equation too?

Chemistry
1 answer:
vampirchik [111]2 years ago
4 0

Answer:

<h2>14.49 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

n =  \frac{N}{L} \\

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{8.72 \times  {10}^{24} }{6.02 \times  {10}^{23} }  \\  =  14.48504...

We have the final answer as

<h3>14.49 moles</h3>

Hope this helps you

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1. Which of the following choices demonstrates the law of constant composition? (Slides 2 ‒ 3: Laws on Matter) (a) Nitrogen and
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Answer:

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8 0
3 years ago
What is the molarity of each ion in a solution prepared by dissolving 0.520 g of na2so4, 1.186 g of na3po4, and 0.223 g of li2so
Leto [7]
First  calculate  the  number  of moles  of  each  ion  present
for  Na2So4  is
0.52/142=0.0037moles
Na+  =0.0037  x2 =0.0074moles
SO4^-2  =0.0027moes

for Na3PO4=  1.186/164=0.0072 moles
Na+   =0.0072  x3=0.0216moles
po4  ions =  0.0072  moles

for LiSo4 =0.223/110=0.002moles
Li  ions=0.002 x2  =0.004mole
SO4  ions =0.002moles
total moles  for
Na  ions  =0.0216  +0.0074 =0.029moles
forSO4 ions =0.0037 +0.002=0.0057moles
molarity is  therefore
Na  ion=0.029/0.1=0.29M
SO4  ions=0.0057/0.1=0.057M
Li  ions =0.004/0.1=0.04M
PO4  ions=0.0072/0.1=0.072M

8 0
3 years ago
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