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Keith_Richards [23]
3 years ago
11

How many atoms of each element are present in 3.2 moles of k2so3

Chemistry
2 answers:
RideAnS [48]3 years ago
7 0

Answer:- 3.85*10^2^4 atoms of K, 1.93*10^2^4 atoms of S and 5.78*10^2^4 atoms of O.

Solution:- We have 3.2 moles of K_2SO_3 . Looking at it's molecular formula, it has two K, one S and three O. It means, 1 mole of the compound has two moles of K, one mole of S and 3 moles of O.

Now we could calculate the moles of each present in 3.2 moles of the compound as..

So, moles of K = 3.2 mol of compound x (2 mol K/mol of compound) = 6.4 mol K

moles of S = 3.2 mol of compound x (1mol S/1mol compound) = 3.2 mol S

moles of O = 3.2 mol of compound x (3 mol O/1mol compound) = 9.6 mol O

Now to convert the moles of each to atoms, we multiply by Avogadro number.

atoms of K = 6.4 mol x (6.022 x 10^23 atoms/1mol) = 3.85*10^2^4 atoms of K

atoms of S = 3.2 mol x (6.022 x 10^23 atoms/1mol) = 1.93*10^2^4 atoms of S

atoms of O = 9.6 mol x (6.022 x 10^23 atoms/1mol) = 5.78*10^2^4 atoms of O

Irina-Kira [14]3 years ago
5 0
1.9264*10^23  is the answer
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In the laboratory you dissolve 19.4 g of potassium acetate in a volumetric flask and add water to a total volume of 125 mL. What
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The molarity of the potassium acetate solution given the data is 1.584 M

<h3>What is molarity? </h3>

This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

<h3>How to determine the mole of CH₃COOK</h3>
  • Mass of CH₃COOK = 19.4 g
  • Molar mass of CH₃COOK = 98 g/mol
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Mole = mass / molar mass

Mole of CH₃COOK = 19.4 / 98

Mole of CH₃COOK = 0.198 mole

<h3>How to determine the molarity of CH₃COOK</h3>
  • Mole of CH₃COOK = 0.198 mole
  • Volume = 125 mL = 125 / 1000 = 0.125 L
  • Molarity of CH₃COOK = ?

Molarity = mole / Volume

Molarity of CH₃COOK = 0.198 / 0.125

Molarity of CH₃COOK = 1.584 M

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2 years ago
All scientific ___________ must be based on careful and rational examinations of the facts.
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Determine the equilibrium constant, Keq, at 25°C for the reaction
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Explanation:

The given chemical reaction is:

2Br^- (aq) + I_2(s)  Br_2(l) + 2I^- (aq)

E^ocell=oxidation potential of anode + reduction potential of cathode\\

The relation between Eo cell and Keq is shown below:

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The value of Eo cell is:

Br- undergoes oxidation and I2 undergoes reduction.

Reduction takes place at cathode.

Oxidation takes place at anode.

Hence,

E^ocell= (-1.07+0.53)V\\=-0.54V

F=96485 C/mol

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T=298K

Substitute all these values in the above formula:

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3 years ago
1) How many moles are in 4.0x10^24 atoms?
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Answer:

<h2>6.64 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} \\

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N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

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We have the final answer as

<h3>6.64 moles</h3>

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