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Answer:

0.03

Explanation:

22.8 g Ba(OH)2 (1 mol Ba (OH)2/ 171.34 g) = 0.133 mol Ba (OH)2

77.2 g H2O (1 mol H2O/18 g) = 4.29 mol H2O

X= molar fraction= mol Ba(OH)2/ mol total

X= 0.133/ (0.133+4.29) = 0.03

0.03 is the mole fraction of [tex]Ba(OH)_2[/tex] in an aqueous solution that contains 22.8% [tex]Ba(OH)_2[/tex] by mass.

The ratio of the number of moles of one component of a solution or other mixture to the total number of moles representing all of the components.

Moles of [tex]Ba(OH)_2[/tex]

Moles = [tex]\frac{mass}{molar \;mass}[/tex]

Moles = [tex]\frac{22.8 g Ba(OH)_2}{171.34 g}[/tex]

= 0.133 mol [tex]Ba (OH)_2[/tex]

Moles of [tex]H_2O[/tex]

[tex]Moles = \frac{mass}{molar \;mass}[/tex]

[tex]Moles = \frac{77.2 g H_2O}{18 g}[/tex]

= 4.29 mol [tex]H_2O[/tex]

The mole fraction of [tex]Ba(OH)_2[/tex]

[tex]\frac{mol Ba(OH)_2}{total \;mol}[/tex]

= 0.03

0.03 is the mole fraction of [tex]Ba(OH)_2[/tex] in an aqueous solution that contains 22.8% [tex]Ba(OH)_2[/tex] by mass.

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Answer:

A gene is a stretch of DNA or RNA that determines a certain trait. Genes mutate and can take two or more alternative forms; an allele is one of these forms of a gene. Chromosomes occur in pairs so organisms have two alleles for each gene one allele in each chromosome in the pair.

By multiplying the mass value by 1000.

Answer:

Hey!

What you have to do is to multiply the amount of mass  * i.e. 67.9g * by 1000 * 67,900kg! *

Explanation:

HOPE THIS HELPS!

Purple Arrow (top arrow) goes to 2, (Roxanne measures temperature)

Blue arrow (second arrow) goes to 4 (As the sun rises, roxanne feels the warmth)

Orange arrow (third arrow) goes to 3 (Roxanne wonders if only the air warms from the sun)

and green arrow (last arrow) goes to 1 (Roxanne thinks that all materials are warmed by the son)

I hope I helped chief, May I have brainliest when available

Answer:

1812g

Explanation:

So molarity is moles/litres or M= mol/liter (lets apply this formula to find moles)

M=mol/L

1.99=mol/2.66

Moles= 5.2934 moles of C12H22O11

Next step is quite simple, we know molar mass of C12H22O11 is 342.3 g/mol so we simply multiply the moles we get to molar mass we are left with the grams needed,

5.2934 moles of C12H22O11 * 342.3 g C12H22O11 /mol = 1812g

(I have left out decimal places, you can caculate this and add them if you desire)

Answer:

The volume occupied by the gas is 1.302 × 10⁻³ m³

Explanation:

2HNO₃(aq) + Mg(s) → Mg(NO₃)₂ + H₂(g)

From the above reaction, we have that 2 moles of HNO₃ combine with 1 mole of Mg to produce 1 mole of Mg(NO₃)₂ and 1 mole of H₂

In the question, we have 155.0 mL of a solution of 0.75 M HNO₃ combining with 270 g of magnesium

Therefore, number of moles of HNO₃ = 0.75×155.0/1000 = 0.11625 moles

[tex]Number \, of \, moles \ of \ magnesium = \frac{Mass \ of \, magnesium}{Molar \, mass \ of \, magnesius} = \frac{270}{24.305} = 11.11 \ moles[/tex]

Therefore, HNO₃ is the limiting reaction, hence;

0.11625 moles of HNO₃ will react with 1/2×0.11625 moles or 0.058125 moles of Mg to produce 0.058125 moles of H₂

Hence since we now know the volume of H₂ produce, we can find the volume occupied at STP by the following universal gas equation relationship;

PV = nRT

Therefore;

[tex]V = \frac{n \times R \times T}{P}[/tex]

Where:

V = Volume of occupied by the gas = Required quantity

n = Number of moles = 0.058125 moles

R = Universal gas constant = 8.3145 J/(mol·K)

T = Temperature of the gas at STP = 273.15 K

P = Pressure of the gas at STP = 1 atm = 101325 Pa

[tex]V = \frac{0.058125 \times 8.3145 \times 273.15}{101325} = 1.302 \times 10^{-3} m^3[/tex]

Answer:

Vacuole

EXPLAINATION?:

A vacuole is a membrane-bound organelle which is present in all plant and fungal cells and some protist, animal and bacterial cells.

the same :/

Answer:

Vacuole

Explanation:

Answer:

Q= 29.2 J

Explanation:

22°C=295K

37°C=310K

Q= mC dT

Q= (15.0 g) *(0.130 J/g-K)* (310 K-295K)

Q= 29.2 J

29.2 J is required to raise the temperature of 15.0 g of lead from 22.0 °C to 37.0 °C.

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases by 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

Given data:

22°C=295K

37°C=310K

Applying specific heat capacity formula:

Q= mC dT

Putting all the values in the formula:

Q= (15.0 g)  X (0.130 J/g-K) X (310 K-295K)

Q= 29.2 J

Hence, 29.2 J is required to raise the temperature of 15.0 g of lead from 22.0 °C to 37.0 °C.

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Answer:

A) light is required

Explanation:

ATP, Glucose, and oxygen are created from the process

Answer:

M=0.02

Explanation:

85 g NaNO3  -> 1 mol NaNO3

0.45 g NaNO3 ->x

x=(0.45 g NaNO3 * 1 mol NaNO3)/85 g NaNO3       x= 5.3 x 10^-3 mol

265 mL= 0.265 L

M= mol solute/ L solution

M= 5.3 x 10^-3 mol NaNO3/0.265 L            M=0.02

Answer:

Explanation:

2C₂H₂(l)  +  50₂(g) =   4CO₂(g)  +  2H₂O(g)

2 mol          5 mol

2 mol of C₂H₂ reacts with 5 mol of O₂

37 mol of C₂H₂  will require 5/2 x 37 mol of O₂

= 92.5 mol of O₂

But oxygen available is only 81 mol so formation of product will be controlled by oxygen available . Hence oxygen is the limiting factor.

Answer:

Limiting reactant is CS2

% yield = 131.8 %

Explanation:

Using the alanced equation given, Mole ratio of C to CS2 is 1 : 5.

That is, for every 1 mole of CS2 used, 5 moles of Carbon is produced.

35g of CS2 --- [tex]\frac{35}{76.14}[/tex] moles

= 0.4597 moles

⇒ mass of C produced = 5 × 0.4597 × 12 g/mol

= 27.6 g of C.

Percentage yield (%) = [tex]\frac{actual- yield}{theoretical- yield}[/tex]

= [tex]\frac{36.4}{27.6} * 100[/tex] =131.9%

According to mole concept, there are 368.928 g  mass in 4.2 moles of FeO₂.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Number of moles=mass/molar mass

Thus, mass=4.2×87.84=368.928 g.

Thus, there are 368.928 g  mass in 4.2 moles of FeO₂.

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Answer:

true

Explanation:

Answer:

True, new evidence can lead to a change in scientific knowledge.

Explanation:

Answer:

True statements: B and C

Explanation:

A is not true NaCl is product

D is not true the reaction occurs

Answer:

unbalanced

Explanation:

Cl and H have an extra atom

- Hope that helps! Please let me know if you need further explanation.

Answer:

NaNO3

Explanation:

Hello,

In this case, the required reaction is an acid-base neutralization reaction which is said to be:

[tex]HNO_3+NaOH\rightarrow NaNO_3+H_2O[/tex]

There, we see that the sodium displaced the hydrogen in the nitric acid to form sodium nitrate a very used salt in the industry, so, as a result of that displacement, water is formed as the secondary neutralization product. For the above mentioned, answer is NaNO3 .

Best regards.

Answer: NaNO3

Explanation:

A salt sodium nitrate (NaNO3) is formed alongside water (H2O) when HNO3 and a solution of NaOH undergoes a neutralization reaction.

HNO3 + NaOH -------->  NaNO3   + H2O

Answer & Explanation:

The molar mass of calcium chloride is 110.98 g/mol. We can use this information to solve this problem. We can set up our equation like this..

[tex]\frac{333 g(CaCl2)}{} *\frac{1mol(CaCl2)}{110.98g(CaCl2)}[/tex]

Multiply straight across on the top and straight across on the bottom.

[tex]\frac{333}{110.98}[/tex]

Now divide.

[tex]\frac{333}{110.98}=3.00[/tex]

So, there are 3.00 moles of calcium chloride contained in a 33 gram sample which is answer choice D.

Answer:

There are 0.12269 Liters of Iron

Explanation:

First, by means of the molecular weight equation, the grams of iron corresponding to 17.3 moles can be calculated:

[tex]MW=\frac{mass(grams)}{moles}[/tex]

[tex]mass=MW*moles=55.845\frac{g}{mol} *17.3mol=966.119 g[/tex]

Then using the density equation the iron milliters are calculated:

[tex]d=\frac{mass(g)}{volume(mL)}[/tex]

[tex]volume=\frac{mass}{density}=\frac{966.119g}{7.874\frac{g}{mL} } =122.69 mL[/tex]

Milliliters to liters are converted:

122.69 mL = 0.12269 L of Iron.

Answer:

[tex]V_{Fe}=0.125L[/tex]

Explanation:

Hello,

In this case, given the moles of iron, we need to use it atomic mass (55.845  g/mol) and density (7.874 g/cm³) in order to firstly convert from moles to grams and secondly from grams to cubic centimetres:

[tex]V_{Fe}=17.6molFe\times \frac{55.845gFe}{1molFe}*\frac{1cm^3}{7.874gFe}=124.8cm^3[/tex]

Finally, we obtain the volume in litres by:

[tex]V_{Fe}=124.8cm^3*\frac{1L}{1000cm^3} \\\\V_{Fe}=0.125L[/tex]

Best regards.

Answer:

Electrical energy

Explanation:

Electrical energy is caused by the moving of electrons.

hope it helps!

Answer:

hydrogen

Explanation:

Hello!

Let's start:

1. The members on each side of the river with unfavorable traits for their climate will pass away, manage to produce offspring with favorable traits, or try their best to adapt.

2. A flood isolated the rabbits.

3. If the river and climate conditions remain the same as described above, the original species of rabbit will produce offspring that have favorable traits and eventually most of the rabbits will have those traits.

4. Genetic variation allows different genes to form, and since natural selection is the survival of the fittest, those that were born with favorable traits will survive and reproduce.

5. Geographic isolation.

6. A new species could form because there is no guarantee that the rabbits have the traits necessary to survive. If one with them reproduces, then there's a chance that a new species will be created eventually.

I hope I helped! Feel free to message me or leave a comment below if you need me to explain anything.

Answer:

C

Explanation:

APEX

Strengths of dipole-dipole forces per mole range from 5 kJ to 20 kJ. The only time they have an impact is when the molecules involved are close to one another because they are significantly weaker than ionic or covalent connections. Dipole forces hold polar molecules together. The correct option is C.

In a process known as dipole-dipole interaction, molecules with permanent dipoles pull towards one another electrostatically; the positive end of one molecule attracts the negative end of another, and so on.

Intermolecular attraction, or the attraction of two molecules, includes dipole-dipole interactions. Electrostatic interactions between the fixed dipoles of various molecules are known as dipole-dipole interactions. By aligning the molecules, these interactions strengthen the attraction.

Dipole-Dipole interactions result when two dipolar molecules interact with each other through space.

Thus the correct option is C.

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Answer:

Cut trees at a sustainable rate

and

Plant one tree for every tree that is cut.

hope i helped, if i could get brainliest that would be great

Answer:

orbiting closer to the earth's surface.....im pretty sure abt it

Answer: Volume =  50.0 mL in liters : 50.0 / 1000 = 0.05 L

n = M x V

n = 0.20 x 0.05

n = 0.01 moles of solute

Explanation:

The number of moles of solute are present in 50.0 mL of 0.20 M of KNO₃ solution is 0.01 moles.

Moles will be calculated by using the molarity formula because molarity is define as the no. of moles of solute present in per liter of the solution as:

M = n/V, where

M = molarity of KNO₃ = 0.2 M

V = volume of solution = 50mL = 0.05L

Moles will be calculated as:

n = (0.2)(0.05) = 0.01 moles

Hence required moles are 0.01 moles.

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Answer:

The theoretical yield of

Li

3

N

is

20.9 g

.

Explanation:

Balanced Equation

6Li(s)

+

N

2

(

g

)

→

2Li

3

N(s)

In order to determine the theoretical yield, we must first find the limiting reactant (reagent), which will determine the greatest possible amount of product that can be produced.

Molar Masses

Li

:

6.941 g/mol

N

2

:

(

2

×

14.007

g/mol

)

=

28.014 g/mol

Li

3

N

:

(

3

×

6.941

g/mol Li

)

+

(

1

×

14.007

g/mol N

)

=

34.83 g/mol Li

3

N

Limiting Reactant

Divide the mass of each reactant by its molar mass, then multiply times the mole ratio from the balanced equation with the product on top and the reactant on bottom, then multiply times the molar mass of

Li

3

N

.

Lithium

12.5

g Li

×

1

mol Li

6.941

g Li

×

2

mol Li

3

N

6

mol Li

×

34.83

g Li

3

N

1

mol Li

3

N

=

20.9 g Li

3

N

Nitrogen Gas

34.1

g N

2

×

1

mol N

2

28.014

g N

2

×

2

mol Li

3

N

1

mol N

2

×

34.83

g Li

3

N

1

mol Li

3

N

=

84.8 g Li

3

N

Lithium produces less lithium nitride than nitrogen gas. Therefore, the limiting reactant is lithium, and the theoretical yield of lithium nitride is

20.9 g

.

Explanation:

Answer:

In the roller coasters the potential energy that is given is the gravitational potential energy, which this energy increases its value as the object moves away from the earth, that is to say, the more height the roller coaster acquires the more gravitational potential energy it will have, and Said train where people usually get on the roller coaster will descend or descend with greater acceleration.

This gravitational potential energy once the mountain begins to descend or descend is converted into kinetic energy

Explanation:

This that we wrote above is considering that the roller coaster does not have curved routes but rectilinear, in the case that it had curved routes, a force would be added in addition to those written that is the centripetal force, it is the same force that appears in the centrifuges or dryers of clothes or the same washing machine. This force, the centripetal force is the force that draws a moving object, in a curvilinear path, towards the center of the curvature.