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Marina86 [1]
3 years ago
14

The total number of sodium atoms in 46.0 grams of solution is?

Chemistry
2 answers:
USPshnik [31]3 years ago
7 0
Molar mass Na = 23g/mol
46g = 456/2 = 2mol
1mol = 6.022*10^23 atoms
2mol = 2*6.022*10623
= 1.204*10^24 atoms
madam [21]3 years ago
3 0
First step, is to find the Molar Mass.
If you go to the periodic table, the Molar Mass of the Sodium Na is 23g/mol

Second Step, you convert from grams to moles.
number of Mole = mass of sodium / molar mass = \frac{46}{23}  = 2 mol

Third Step, you find the number of atoms.
As We know, Avogadro said that the number of atoms in 1 mole is about 6.022 * 10^{23}.
You use the Rule of three and you find the number of atoms!
1 mole = 6.022 * 10^{23} atoms
2 mole = x atomes
x = 2 * ( 6.022 * 10^{23} )
x= 12.044 * 10^{23} atomes

So, there is 12.044 * 10^{23} atoms of Sodium Na in 46g of Solution.

Hope this Helps! :D
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Explanation:

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3 years ago
Ascorbic acid (H2C6H6O6; H2Asc for this problem), known as vitamin C, is a diprotic acid (Ka1= 1.0x10–5 and Ka2= 5x10–12) found
Igoryamba

Answer:

The concentrations are :

[HAsc^-]=0.000702 M

[Asc^{2-}]=5.92\times 10^{-8} M

The pH of the solution is 3.15.

Explanation:

H_2Asc\rightleftharpoons HAs^-+H^+         K_{a1}=1.0\times 10^{-5}

Initial

c                0              0

Equilibrium

c-x                x          x

K_{a1}=\frac{[HAs^-][H^+]}{[H_2Asc]}

1.0\times 10^{-5}=\frac{x\times x}{(c-x)}

1.0\times 10^{-5}=\frac{x^2}{(0.050-x)}

Solving for x:

x = 0.000702 M

[HAsc^-]=0.000702 M

HAsc^-\rightleftharpoons As^{2-}+H^+        K_{a2}=5\times 10^{-12}

Initially

x                0          0

At equilibrium ;

(x - y)            y         y

K_{a2}=\frac{[As^{2-}][H^+]}{[HAsc^-]}

5\times 10^{-12}=\frac{y\times y}{(x-y)}

5\times 10^{-12}=\frac{y^2}{(x-y)}

Putting value of x = 0.000702 M

5\times 10^{-12}=\frac{y^2}{(0.000702 -y)}

y=5.92\times 10^{-8} M

[Asc^{2-}]=5.92\times 10^{-8} M

Total concentration of [H^+]=x+y=0.000702 M+5.92\times 10^{-8} M=7.0206\times 10^{-4} M

The pH of the solution :

pH=-\log[H^+]

pH=-\log[7.0206\times 10^{-4} M}=3.15

7 0
3 years ago
What is the pH of a solution with an H3O+ concentration of 5.67 x 10-4 M?
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Answer:

<h2>3.25 </h2>

Explanation:

The pH of a solution can be found by using the formula

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From the question we have

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We have the final answer as

<h3>3.25 </h3>

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The atomic mass of the  magnesium is : 24.31⋅g.

<h3>What is isotopes?</h3>

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Magnesium has three natural isotopes: ²⁴Mg, ²⁵Mg, and ²⁶Mg.

<h3>What is atomic mass ?</h3>

Atomic mass is the mass of an atom. The SI unit of mass is the kilogram, while atomic mass is often expressed in the non-SI unit dalton (synonymous with uniform atomic mass unit). 1 Da is defined as 1/12 the mass of a free carbon-12 atom at rest in the ground state.

Calculation :

The atomic mass is the weighted average of the individual isotopic masses:

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Temperature of the water to the nearest degree:___ °C
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Answer:

From the image the answer is 24.

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