Explain the following a. the mole of a substance. b.a standard solution​

Based on the data given, the molar mass of the gas is 165.5 g/mol while the molecular weight of the gas is 165.5 amu

The molar mass of a gas can be obtained from density, temperature and pressure using the formula below:

Molar gas constant, R = R = 0.082 L.atm/mol/K.

Temperature = 150 °C = 423 K

Pressure = 785 torr = 1.033 atm

density = 4.93 g/L

molar mass of gas = 4.93 × 0.082 × 423/1.033

molar mass of gas = 165.5 g/mol

Then, molecular weight of the gas = 165.5 amu

Therefore, the molar mass of the gas is 165.5 g/mol while the molecular weight of the gas is 165.5 amu

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The east to west daily motions of stars, planets, the Moon, and the Sun are caused by the rotation of the Earth on its axis. The Earth and all the planets revolve around the Sun on circular orbits. This produces the change in constellations observed from one time of year to the next.

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Answer:

A. 46

Explanation:

Human cells normally contain 23 pairs of chromosomes, for a total of 46 chromosomes in each cell .

Answer:

Wind pushes air parcels even higher in the troposphere, where it is colder. The air parcels will then lose more energy and more rain can happen.

Explanation:

Answer:

Wind propels air packages upward into the troposphere, which is cooler. As a result, the air packets will lose more energy and more rain may fall.

Explanation:

Answer:

2 mol/L

Explanation:

molarity = moles/litres

NaOH = 23 + 16 + 1 = 40 g/mol

[tex] ? \: mol \: naoh \: = 8 \: g \: naoh \: \times \\ \frac{1 \: mol \: naoh}{40 \: g \: naoh} = 0.2 \: mol \: naoh[/tex]

molarity = 0.2 mol/0.1 L = 2 mol/L

Answer: Silver has the highest temp. change and water has the lowest temp. change.

Explanation:

According to the specific heat capacity, water  has lowest specific heat and greatest is that of silver owing to their temperature differences.

Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.

It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.It is different for different substances.

It is given by the formula ,

Q=mcΔT

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Answer:

20W

Explanation:

the power of qn object doing work w in a given time t is given by

p= w/t

Answer:

Half mole or 0.5 moles

__________________________________________________________

Oxygen has a molar molar mass of 32 g.

This means that O2 will have half that amount of grams, half-mole-substance.

6.022*10^23 molecules are present in one mole of any substance, so half it for O2.

6.022 × 10²³ [tex]-- >[/tex] 3.011 × 10²³

And simplified, that would make your answer 0.5 moles.

________________________________________________________

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Answer:

C

Explanation:

Answer:

it is created by movement of molecules with higher energy upwards and the movement of molecules with lower energy downwards

Explanation:

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Answer:

5

Explanation:

First find the balanced equation for this rxn

C3H8    +  5O2    ====>     3 CO2    + 4  H2O

To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. The correct option is option A.

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.

Propane gas, C[tex]_3[/tex]H[tex]_8[/tex], burns in excess oxygen gas. When the equation for this reaction is correctly balanced and all coefficients are reduced to their lowest whole-number terms, the coefficient for O[tex]_2[/tex] is 5.

C[tex]_3[/tex]H[tex]_8[/tex]    +  5O[tex]_2[/tex]  [tex]\rightarrow[/tex]   3 CO[tex]_2[/tex]    + 4  H[tex]_2[/tex]O

Therefore, the correct option is option B.

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Answer: 23

I hope this helps! Have a good day! :)

Answer: Your answer is D. Energy is absorbed.

Hope this helps!

Answer:

Energy is absorbed

Explanation:

For sublimation ....let's look at ice as an example

 you must add calories (heat ) to melt the ice and then heat to produce water vapor  .... sublimation requires energy input

The number of moles contained in 39 L of F2 gas at STP is 1.74mol. Details on how to calculate number of moles can be found below.

The number of moles of a gas at STP can be calculated using the following formula:

PV = nRT

Where;

At STP, the following applies:

1 × 39 = n × 0.0821 × 273

39 = 22.41n

n = 1.74mol

Therefore, the number of moles contained in 39 L of F2 gas at STP is 1.74mol.

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Answer:

Fluid power systems perform work by a pressurized fluid bearing directly on a piston in a cylinder or in a fluid motor. A fluid cylinder produces a force resulting in linear motion, whereas a fluid motor produces torque resulting in rotary motion. Within a fluid power system, cylinders and motors (also called actuators) do the desired work. Control components such as valves regulate the system.

Choosing the material with the highest specific heat capacity is ideal and true.

This is defined as the quantity of heat needed to raise the temperature per unit mass.

Insulators have a higher specific heat capacity as it takes more time for them to absorb heat thereby making it ideal in building an  insulated home.

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V1= 19.229L

Explanation:

V1/T1 = k

V1/836.06=14.509/625.06

V1/836.06= 0.023

V1 = 19.229L

The temperature of CI₂ is changed from 836.06K to 625.06K. If it's new volume is 14.509L then its original volume in liters was 19.4 L.

The combined gas law is the law of of gaseous state which is made by combination of Boyle's law, Charle's law, Avogadro's law and Gay Lussac's law.

It is a mathematical expression that relates Pressure, Volume and Temperature.

(P1 × V1)÷T1 = (P2 × V2)÷T2

We can also use the following relation-

PV = nRT

According to the question, Pressure is constant and we can write the formula as-

V1÷T1 = V2÷T2

T1 = 836.06 K

T2 = 625.06 K

V1 = ?

V2 = 14.509 L

V1 = 19.4 L

Therefore, The temperature of CI₂ is changed from 836.06K to 625.06K. If it's new volume is 14.509L then its original volume in liters was 19.4 L.

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Answer:

The Symbol Of Sodium Peroxide Is Na2O2

Answer:

Na2O2

Explanation:

Answer:

D) Sea level will continue to rise

Answer:

Total flow: = 1000 cfm = 4.7 x 10 ml/sec. Stack Ht.: 2.7m (9 ft) ... 1.2x10-8. 6.4x10 7. C-14. 4.3x10 7. 1.0x10 5. 2.0x10 8. 1.1x10-8. Na-22. 1.3x1i dont know how to explain it

Answer:

Potassium will donate an electron to bromine.

Explanation:

When potassium and bromine come together, the more electronegative bromine will snatch that solitary valence electron from the potassium atom. This will lead to the formation of the potassium cation, K+ , and the bromide anion, Br− .

hope it's helpful for you brother...

:-befrank

Answer:

summers get hotter, and it can get more sticky or humid sometimes.

Explanation:

think of the seasons and the tempatures.

A mixture of heptane and 1-propanol  easily dissolved using DEGS because diethylene glycol sussinate (C8H14O6) 1 propanol easily dilutes and retain surface.

Generally, a mixture speaks to the joining of two different substance in other to achieve a different substance or something combining or becoming matched.

In conclusion, SE-30  is  neutral in nature, DEGs is a stationary phase containing a non-volatile liquid phase. It also includes polar group OH types,

Hence, using Hydrogen bonding it can easily bind  1-propanol.

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Answer:

121.3 ml

Explanation:

Mole wts

Na    22.989 x 2

C    12.011

O 15.999 x 3      total = 105.986

45 grams is   45/105.986 of a mole

    45/105.986  in one liter would be .424584 M

   .424585 mole / x liter = 3.5

   x = .1213 liter = 121.3 ml

The products of chemical reactions are made up of the atoms of the reactants.

Organic products are chemical compounds that are obtained in a reaction in which there are organic compounds or elements as reactants. The basic types of organic chemical reactions are:

To identify an organic product we must take into account that all organic chemical compounds have carbon in their composition.

Note: This question is incomplete because there is some information missing. However I can answer it based on my general prior knowledge.

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In a chemical reaction, bonds between atoms in the reactants are broken and the atoms rearrange and form new bonds to make the products.

The atoms get rearranged into new substances.

Answer:

1.85 g of hydrogen gas will form!

Explanation:

1. Write the balanced equation.

Zn

+

2HCl

→

ZnCl

2

+

H

2

2. Calculate the moles of

Zn

.

Moles of Zn

=

30.0

g Zn

×

1 mol Zn

65.38

g Zn

=

0.4589 mol Zn

3. Calculate the moles of

H

2

.

Moles of H

2

=

0.4589

mol Zn

×

2 mol H

2

1

mol Zn

=

0.9177 mol H

2

4. Calculate the mass of

H

2

.

Mass of H

2

=

0.9177

mol H

2

×

2.016 g H

2

1

mol H

2

=

1.85 g H

2

Virtual water is water used in the production of services and goods that consumers need and enjoy.

So, option A is correct.

Virtual water  is very important as it helps us understand the dependencies our economies have on others' resources.

In addition with the water footprint, virtual water enables us to map out the dependencies and to identify when and where risks may lie, in terms of scarcity and pollution as it's implications is found for food security, economy and diplomacy.

Virtual water is not water that has not yet fallen to Earth as precipitation and cannot be seen.

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Answer:

A and B are the same answer lol

Explanation:

Explanation:

Lithium Sodium Potassium group 1

Hydrogen proton +1

Iron Fe2+