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Arte-miy333 [17]
3 years ago
14

How many totals atoms are present in the compound : Mg(OH)2 A. 3 B. 4 C. 5 D. 7

Chemistry
1 answer:
Semenov [28]3 years ago
5 0

1 atom Mg, 2 atoms O and 2 atoms H.

1 + 2 + 2 = 5, so correct answer is C

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When 0.491 grams of a protein were dissolved in 44 mL of benzene at 24.4 degrees C, the osmotic pressure was found to be 50.9 to
Ira Lisetskai [31]

Answer:

4057.85 g/mol

Explanation:

Hello, the numerical procedure is shown in the attached file.

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Two elements in the same period have the same number of _____ _____ in their electron clouds.
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Answer:

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6 0
4 years ago
How many moles are 7.25 x 1023 formula units of Mgo ?
romanna [79]

Answer:

<h2>The answer is option D</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{7.25 \times  {10}^{23} }{6.02 \times  {10}^{23} }  =  \frac{7.25}{6.02}  \\  = 1.2043189368...

We have the final answer as

<h3>1.20 moles</h3>

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3 years ago
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