What’s the correct answer ?

Answer:

[tex]m_{cryst}=58g[/tex]

Explanation:

Hello there!

In this case, according to the attached solubility chart, it is possible for us to realize that about 88 grams of KNO3 are soluble at 50 °C but just 30 grams are soluble at 20 °C in the same 100 g of water.

In such a way, the crystalized mass of this solute can be calculated by subtracting the mass at 50 °C and the mass at 20 °C:

[tex]m_{cryst}=88g-30g\\\\m_{cryst}=58g[/tex]

Best regards!

Answer:

The correct option is option;

A. 1.58 mol

Explanation:

The given balanced chemical reaction is presented as follows;

2Al₂O₃ → 4Al + 3O₂

The given mass of Al produced = 85.5 grams

The given molar mass of Al₂O₃ = 85.962 g/mol

The given molar mass of O₂ = 31.998 g/mol

The given molar mass of Al = 26.982 g/mol

[tex]We \ note \ that \ the \ number \ of \ moles, \ n = \dfrac{Mass }{Molar \ mass}[/tex]

For the given produced Al, n = 85.5 g/(26.982 g/mol) ≈ 3.169 moles

From the given reaction, we have;

2 moles of Al₂O₃ produces 4 moles of Al

∴ 2/4 moles of Al₂O₃ produces 4/4 = 1 mole of Al

2/4 × 3.169 = 1.5845 moles of Al₂O₃ produces 1 × 3.169 = 3.169 moles of Al

∴ 1.5845 ≈ 1.58 moles of Al₂O₃ produces 3.169 moles of Al ≡ 85.5 grams of Al

The correct option is approximately 1.58 moles of Al₂O₃.

Answer: This is a typical acid/base equilibrium problem, that involves the use of logarithms.

Explanation:We assume that both nitric acid and hydrochloric acid dissociate to give stoichiometric

H

3

O

+

.

Moles of nitric acid:

26.0

×

10

−

3

⋅

L

×

8.00

⋅

m

o

l

⋅

L

−

1

=

0.208

⋅

m

o

l

H

N

O

3

(

a

q

)

.

And, moles of hydrochloric acid:

88.0

×

10

−

3

⋅

L

×

5.00

⋅

m

o

l

⋅

L

−

1

=

0.440

⋅

m

o

l

H

C

l

(

a

q

)

.

This molar quantity is diluted to

1.00

L

. Concentration in moles/Litre =

(

0.208

+

0.440

)

⋅

m

o

l

1

L

=

0.648

⋅

m

o

l

⋅

L

−

1

.

Now we know that water undergoes autoprotolysis:

H

2

O

(

l

)

⇌

H

+

+

O

H

−

. This is another equilibrium reaction, and the ion product

[

H

+

]

[

O

H

−

]

=

K

w

. This constant,

K

w

=

10

−

14

at

298

K

.

So

[

H

+

]

=

0.648

⋅

m

o

l

⋅

L

−

1

;

[

O

H

−

]

=

K

w

[

H

+

]

=

10

−

14

0.648

=

?

?

p

H

=

−

log

10

[

H

+

]

=

−

log

10

(

0.648

)

=

?

?

Alternatively, we know further that

p

H

+

p

O

H

=

14

. Once you have

p

H

,

p

O

H

is easy to find. Take the antilogarithm of this to get

[

O

H

−

]

.

Answer link  

Answer: static electricity

Explanation: rubbing the comb creates. Static charge to comb

Answer:

[tex]P_N=0.987atm[/tex]

Explanation:

Hello there!

In this case, for these problems about collecting a gas over water, we must keep in mind that once the gas has been collected, the total pressure of the system is given by the atmospheric pressure, in this case 1.01 atm. Next, since we also have water in the mixture, we can write the following equation:

[tex]P_T=P_w+P_N[/tex]

Thus, by solving for the pressure of nitrogen and using consistent units, we obtain:

[tex]1.01atm=17.5torr*\frac{1atm}{760torr} +P_N\\\\P_N=1.01atm-0.023atm\\\\P_N=0.987atm[/tex]

Answer:

B: 3k+ + 3OH¯ + Fe3+ + 3KOH = Fe3(H) + + 3NO3¯

Explanation:

Potassium hydroxide (KOH) reacts with iron (III).

The normal balanced equation is;

Fe(NO3)3 + 3KOH = Fe(OH)3 + 3KNO3

Now the ionic equation will be;

3k+ + 3OH¯ + Fe3+ + 3KOH = Fe3(H) + + 3NO3¯

Answer:

[tex][C_6H_{12}O_6][/tex]

Explanation:

Hello there!

In this case, since the concept of solution concentration is majorly used in terms of moles per liters of solution or molarity (M), it is also possible to represent this chemical unit by using squared brackets, [ ].

In such a way, when focused on the concentration of glucose, C6H12O6, we can use:

[tex][C_6H_{12}O_6][/tex]

Best regards!

Answer:

"Electron binding energy, more commonly known as ionization energy, is a measure of the energy required to free an electron from its atomic orbital or from a solid. ... The atomic binding energy of the atom is the energy required to disassemble an atom into free electrons and a nucleus."

Explanation:

Hope this helps! <33

God bless your heart <3333

have a wonderful day!

Binding energy is a required amount of energy that disperses the other particles of the reaction system. It measures the energy needed to free an electron or a subatomic particle.

Binding energy is the ionization energy that depicts how much energy will be needed if an electron has to be removed from an atom for a reaction to occur.

It can be said that the energy required to free an electron from the orbit of the atom is measured in electron volt (eV). It is a little different from ionization energy as binding energy can remove any subatomic particle and not just an electron.

Therefore, the binding energy measures the freed subatomic particle.

Learn more about binding energy here:

https://brainly.com/question/16705705

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Answer:

No

Explanation:

A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, new chemical and physical properties of the substance are formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance.

The matter which underwent a chemical change is not still the same substance as before.

This is the type of change which occurs when two substances known as reactants react to form a new product.

The formation of a new product through bonding and other parameters thereby makes the substance to be different as it was before.

Read more about Chemical change here https://brainly.com/question/11987405

Answer:

O butterflies resting on the flower of a plant

Answer:

The answer is butterflies resting on the flower of a plant.

Explanation:

Answer:

[tex]T_2=339K[/tex]

Explanation:

Hello there!

In this case, according to the Charles' gas law as way to understand the volume-temperature as a directly proportional relationship for this problem, we can write:

[tex]\frac{T_2}{V_2}=\frac{T_1}{V_1}[/tex]

Thus, given the initial temperature and volume and the final volume, we are able to calculate the final temperature as follows:

[tex]T_2=\frac{T_1V_2}{V_1} \\\\T_2=\frac{252K*5.25L}{3.90L}\\\\T_2=339K[/tex]

Best regards!

Answer:

Detergents are referred to as soapless soaps because they have a washing action similar to soap but do not contain the typical chemical contents of soaps, such as sodium or potassium salts of long chain fatty acids.

Explanation:

Answer:

The answer is Co2+(aq) + 2 OH-(aq) -> Co(OH)2(s) so the answer is c.

Explanation:

Answer:

1514g of CO₂ reacted

Explanation:

Based on the reaction:

2CO₂ + 43.9kJ → 2CO + O₂

2 moles of carbon dioxide require 43.9kJ of energy to produce 2 moles of carbon monoxide and 1 mole of oxygen

To solve this question, we must convert the 755kJ of energy to moles of carbon dioxide that reacts and to find the mass as follows:

755kJ * (2 moles CO₂ / 43.9kJ)  =34.4 moles of CO₂ are produced

Mass CO₂: Molar mass: 44.01g/mol

34.4 moles CO₂ * (44.01g / mol) =

Answer:

The reaction takes place is

 2 (C2H6) + 7 (O2) → 4(CO2) + 6(H2O) 

According to the equation,

60g ethane requires 7x32= 224g oxygen

here ethane is in excess.oxygen will be consumed completely.

hence

2.9 g O2 will consume 60×2.9/224=0.776g of C2H6

now,

2 moles of C2H6 produces 4 moles of CO2!

60g ethane produces 4x44 g CO2

hence amount of CO2 produced =4×44×0.776/60=2.27g

Answer:

the heat wants to travel up. Heat rises

Explanation:

Answer:

the anwser would be B obtain energy

Explanation:

Answer:

To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons. Example: Find the atomic mass of an isotope of carbon that has 7 neutrons. You can see from the periodic table that carbon has an atomic number of 6, which is its number of protons.

Explanation:

To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons. Example: Find the atomic mass of an isotope of carbon that has 7 neutrons. You can see from the periodic table that carbon has an atomic number of 6, which is its number of protons.

Answer:

those are all physical changes and most physical changes can be undone like crushing a pice of metal you can flatten it back out you anwser is physical change

Explanation:

Answer:

It is a physical change because it can be reversed back and no new subtances is dormed.

Explanation:

2 moles of lead oxide ->

2PbO2 -> 2PbO + O2

Answer:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Lithium, or 6.941 grams.

Thus, the answer would be 16.24194.

Explanation:

Answer:

It is Excretory system.

:)

Answer:

59.92 × 10²³ atoms are in 9.95 moles of iron

1.8 ×10²² molecules are in 0.03 moles of Carbon dioxide

1.19 moles are found in 7.20 x 10^23 atoms of platinum

Answer:

Percent composition  by mulecules is:  (mass of element/molecular mass) x 100

Percent composition by atoms is: (mass of element/molecular mass) x 100.

Explanation:

So their the same

Answer:

Explanation:

Work is a net force applied through a distance in order to displace an object, commonly abbreviated as W. A net force is the sum of all forces acting on an object. Work is mass times acceleration and distance so to find out the work you simply calculate the acceleration of the box being brought in. Next find the distance it was carried to get in the house. Then find out the mass of the box and finally multiply those sums together to get the amount of work put in to bring the package inside.

Answer:

The crop failures were caused by late blight, a disease that destroys both the leaves and the edible roots, or tubers, of the potato plant.

Answer:

It's A.

Atoms that have the same number of valence electrons in their outer shell have similar properties and belong to the same family of elements.

Answer:

Q.1

Given-

Volume of solution-1 L

Molarity of solution -6M

to find gms of AgNO3-?

Molarity = number of moles of solute/volume of solution in litre

number of moles of solute = 6×1= 6moles

one moles of AgNO3 weighs 169.87 g

so mass of 6 moles of AgNO3 = 169.87×6=1019.22

so you need 1019.22 g of AgNO3 to make 1.0 L of a 6.0 M solution

1. the grams of [tex]\rm AgNO_3[/tex] is 1019.22.

2. 10,192.2

Molarity is the measure of the concentration of any solute in per unit volume of the solution.

1. Volume is 1.0 l.

Molarity of solution -6 m

To find the mass of [tex]\rm AgNO_3[/tex]

[tex]\rm Molarity = \dfrac{n}{V}\\\\rm 6 = \dfrac{n}{1}\\\\n = 6 \times 1 = 6[/tex]

Mass of One mole of [tex]\rm AgNO_3[/tex] is 169.87 g

Therefore, the mass of 6 moles will be

169.87 × 6 = 1019.22

2. Molarity of solution 6.0

Volume of solution is 0.1m

The mass of 6 moles will be

169.87 × 6 = 1019.22

[tex]\rm density = \dfrac{mass }{volume} \\\\\rm density = \dfrac{1019.22 }{0.1} = 10,192.2[/tex]

Thus, the options are 1. 1019.22    2. 10,192.2

Learn more about molarity, here