3 years ago

What is the isotope notation of the element that has an atomic number of 24 and a mass number of 52?

Chemistry

1 answer:

Fofino [41]3 years ago

4 0

Answer:

Chromium

Explanation:

Cr has 24 atomic number and mass number 52

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How many Mol are in 4.000 grams of MgCl2 ?

grigory [225]

Answer:

The number of mol is: 0, 042 mol in 4 grams of MgCl2

Explanation:

We calculate the weight of 1 mol of MgCl2:

Weight 1mol of MgCl2= weight Mg + (weight Cl)x 2=

24, 3 grams + 2 x 35, 5 grams = 95, 3 grams/mol MgCl2

95, 3 grams------1 mol MgCl2

4 grams -------x = (4 grams x1 mol MgCl2)/ 95, 3 grams= 0, 04197 mol MgCl2

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4 years ago

In general, a catalyst speeds up a given reaction by providing an alternative mechanism that has a ______ activation energy, thu

prisoha [69]

Answer:

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Explanation:

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2 years ago

Which of the following are functions of the nose?

MArishka [77]

Answer:

The answer should be I and III

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3 years ago

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A buffer solution is composed of 7.50 mol of acid and 4.75 mol of the conjugate base. If the pKa of the acid is 4.90 , what is t

Mamont248 [21]

Answer:

The correct answer is: pH= 4.70

Explanation:

We use the <em>Henderson-Hasselbach equation</em> in order to calculate the pH of a buffer solution:

$pH= pKa + log \frac{ [conjugate base]}{[acid]}$

Given:

pKa= 4.90

[conjugate base]= 4.75 mol

[acid]= 7.50 mol

We calculate pH as follows:

pH = 4.90 + log (4.75 mol/7.50 mol) = 4.90 + (-0.20) = 4.70

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3 years ago

Draw the ground-state electronic configuration for Mg.

vichka [17]

Answer:

(Ne)3s2

Explanation:

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