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2 years ago

How many moles of iron does 50.0 g of iron (Fe) represents?

Chemistry

1 answer:

mixer [17]2 years ago

7 0

0.9mole of Fe

Explanation:

Given parameters:

Mass of Fe = 50g

Unknown:

Number of moles of iron = ?

Solution:

The number of moles is the particle that contains the avogadro's number of particles.

It is a unit for reporting chemical measurement.

To find the number of moles of a substance;

Number of moles = $\frac{mass}{molar mass}$

Molar mass of Fe= 56g/mol

Number of moles = $\frac{50}{56}$ = 0.9mole of Fe

learn more:

Number of moles brainly.com/question/1841136

#learnwithBrainly

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In what layer of the skin is melanin found? What does melanin do for skin cells?

dem82 [27]

Dont know the first part but melanin quantities change the dkin color

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3 years ago

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The freezing point of benzene C6H6 is 5.50°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in benzene is DDT . H

Vlad1618 [11]

Answer: 0.028 grams

Explanation:

Depression in freezing point :

Formula used for lowering in freezing point is,

$\Delta T_f=k_f\times m$

or,

$\Delta T_f=k_f\times \frac{\text{ Mass of solute in g}\times 1000}{\text {Molar mass of solute}\times \text{ Mass of solvent in g}}$

where,

$\Delta T_f$ = change in freezing point

$k_f$ = freezing point constant (for benzene} = $5.12^0Ckg/mol$

m = molality

Putting in the values we get:

$0.400^0C=5.12\times \frac{\text{ Mass of solute in g}\times 1000}{354.5\times 209.0}$

${\text{ Mass of solute in g}}=0.028g$

0.028 grams of DDT (solute) must be dissolved in 209.0 grams of benzene to reduce the freezing point by 0.400°C.

4 0

3 years ago

If an element has 2+ valence electrons, does it transfer only one or more than one valence electrons

just olya [345]

Answer:

element having 2+ valence electrons can transfer its more than one electron that is 2 electron completely.

Explanation:

Group IIA have 2+ valency and two electrons in its valance shell.

Its Electropositivity is high and have the tendency to donate it two electrons.

Element of IIA form ionic with most electronegative element.

Examples:

Cu²⁺, Mg²⁺, Sr²⁺ are examples having 2+ valance electron

one of the following is examples of element that have 2+ valence electrons

MgCl₂

Atomic number of Magnesium (Mg) is 12

Electronic Configuration of Mg:

1s², 2s², 2p⁶, 3s²

K =2

L = 8

M = 2

So, it have to give its 2 electrons to form a stable compound.

Similarly

Chlorine atomic number is 17

Electronic Configuration of Chlorine:

1s², 2s², 2p⁶, 3s², 3p⁵

K =2

L = 8

M = 7

So, it have to gain one electrons to form a stable compound and complete its octet.

So,

Two chlorine atom as a molecule gain 2 electrons from Mg²⁺ atom

So one Mg²⁺ and 2 Cl⁻ atoms form an ionic bond

where in this ionic bond Mg²⁺ transfer its 2 valence electron completely and chlorine molecule accept 2 electrons.

Cl-----Mg------Cl

So the Answer is

element having 2+ valence electrons can transfer its more than one electron that is 2 electron completely.

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2 years ago

What is the density of a sample of the alloy pewter, (a mixture of tin and copper or lead) if a 7.11 cm3 sample has a mass of 53

xxTIMURxx [149]

Answer:

<h3>The answer is 7.47 g/cm³</h3>

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question

mass = 53.137 g

volume = 7.11 cm³

We have

$density = \frac{53.137}{7.11} \\ = 7.473558368...$

We have the final answer as

Hope this helps you

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3 years ago

Name two elements whose outer energy levels are complete with two electrons

cluponka [151]

Answer:

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Explanation:

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3 years ago