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1 year ago

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Which of the following species contains manganese with the highest oxidation number?

1 answer:

ioda1 year ago

7 0

In NaMnO₄, Mn has the highest oxidation number.

The question is incomplete, the complete question is;

Which of the following species contains manganese with the highest oxidation number?

A) Mn

B) MnF₂

C) Mn₃(PO₄)₂

D) MnCl₄

E) NaMnO₄

In order to ascertain the specie that contains manganese with the highest oxidation number, we must calculate the oxidation number of manganese in each of the species one after the other.

1) For Mn, the oxidation number of Mn is zero because the atom is uncombined.

2) For MnF₂;

Mn has an oxidation number of +2

3) For Mn₃(PO₄)₂

Mn has an oxidation number of +2

4) For MnCl₄

Mn has an oxidation number of +4

5) For NaMnO₄

Mn has an oxidation number of +7

Hence in NaMnO₄, Mn has the highest oxidation number.

Learn more: brainly.com/question/10079361

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Three mixtures were prepared from three very narrow molar mass distribution polystyrene samples with molar masses of 10,000, 30,

8_murik_8 [283]

Answer:

(a). 46,666.7 g/mol; 78,571.4 g/mol

(b). 86950g/mol; 46,666.7 g/mol.

(c). 86950g/mol; 43,333.33 g/mol

Explanation:

So, we are given the molar masses for the three samples as: 10,000, 30,000 and 100,000 g mol−1.

Thus, the equal number of molecule in each sample = ( 10,000 + 30,000 + 100,000 ) / 3 = 46,666.7 g/mol.

The average molar mass = [ ( 10,000)^2 + (30,000)^2 + 100,000)^2] ÷ 10,000 + 30,000 + 100,000 = 78,571. 4 g/mol.

(b). The equal masses of each sample = 3/[ ( 1/ 10,000) + (1/30,000 ) + (1/100,000) ] = 20930.23 g/mol.

Average molar mass = ( 10,000 + 30,000 + 100,000 ) / 3 = 46,666.7 g/mol.

(c). Equal masses of the two samples = (0.145 × 10,000) + (0.855 × 100,000)/ 0.145 + 0.855 = 86950g/mol.

The weight average molar mass = 1.7 + 10,000 + 100,000/ 1.7 + 1 = 43,333.33 g/mol.

6 0

1 year ago

The average kinetic energy of water molecules is greatest in which of these samples?(1) 10 g of water at 35°C(2) 10 g of water a

Ipatiy [6.2K]

The question asks about the average kinetic energy so it is not related with mass. We only need to compare the temperature. The higher temperature is, the higher kinetic energy is. So the answer is (2).

3 0

1 year ago

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A food product is being frozen in a system capable of removing 6000 kJ of thermal energy. The product has a specifi c heat of 4

lapo4ka [179]

Answer : The exit temperature of the product is, $-35.2^oC$

Explanation :

Total heat = Heat lost by liquid + Latent heat of fusion + Heat lost by frozen

$Q=m\times c_1\times (T_2-T_1)+m\times L_f+m\times c_2\times (T_4-T_3)$

where,

Q = Total heat = 6000 kJ

m = mass of product = 15 kg

$c_1$ = specific heat of liquid = $4kJ/kg^oC$

$L_f$ = latent heat of fusion = $275kJ/kg$

$c_2$ = specific heat of frozen = $2.5kJ/kg^oC$

$T_1$ = initial temperature of liquid = $2^oC$

$T_2$ = final temperature of liquid = $10^oC$

$T_3$ = initial temperature of frozen = ?

$T_4$ = final temperature of frozen = $2^oC$

Now put all the given value in the above expression, we get:

$6000kJ=[15kg\times 4kJ/kg^oC\times (10-2)^oC]+[15kg\times 275kJ/kg]+[15kg\times 2.5kJ/kg^oC\times (2-T_3)^oC]$

$T_3=-35.2^oC$

Thus, the exit temperature of the product is, $-35.2^oC$

7 0

1 year ago

Gallium is produced by the electrolysis of a solution made by dissolving gallium oxide in concentrated NaOH(aq). Calculate the a

UkoKoshka [18]

Answer:

$m_{Ga}=0.550gGa$

Explanation:

Hello!

In this case, since the applied current for the 50.0 mins provides the following charge to the system:

$q=0.760\frac{C}{s}*50.0min*\frac{60s}{1min}=2,280C$

As 1 mole of electrons carries a charge of 1 faraday, or 96,485 coulombs, we can compute the moles of electrons involved during the reduction:

$n_{e^-}=2,280C*\frac{1mole^-}{96,485C}=0.0236mole^-$

Then the reduction of Ga³⁺ to Ga involves the transference of three electrons, we are able to compute the moles and therefore the mass of deposited gallium:

$m_{Ga}=0.0236mole^-*\frac{1molGa}{3mole^-}*\frac{69.72gGa}{1molGa} \\\\m_{Ga}=0.550gGa$

Best regards!

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A grocery store has 75 dozen packages of hotdogs In stock. If there are 10 hot dogs in each package, how many moles of hot dogs

Viktor [21]

you can just divide 75 and 10

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1 year ago

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