pls help me out! i don’t understand:(

Answer:

Option b (V1/T1 = V2/T2) is the right alternative or the new volume will be "0.048 L".

Explanation:

The given values are:

Temperature,

T₁ = 25°C

or,

   = 298.15 K

T₂ = 50°C

or,

    = 323.15 K

Volume,

V₁ = 45 mL

or,

    = 0.045 L

V₂ = ?

As we know,

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

Or,

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

On substituting the values, we get

⇒       [tex]=\frac{0.045\times 323.15}{298.15}[/tex]

⇒       [tex]=\frac{14.541}{298.15}[/tex]

⇒       [tex]=0.048 \ L[/tex]

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question

3000 g = 3 kg

We have

net force = 3 × 5 = 15

We have the final answer as

Hope this helps you

Answer:

Molarity is the amount (in mole) of solute in a solvent. If the solute is very volatile, then it will evaporated from the solution as temperature rising. So the amount of solute is decreasing, causing the molarity decreasing. If the solvent itself volatile, then the molarity will increase.

(Looked up the answer for you)

The relationship between evaporation and molarity is; the rate of evaporation of will decrease as the molarity increases

Molarity (M) is defined as the amount of a substance in a certain volume of solution. Molarity can also be defined as the number of moles of a solute per liters of a solution.

Now, the rate of evaporation of will decrease as the solute concentration increases due to the fact that for the same surface area for evaporation, as the concentration of the solute increases, less water molecules will get exposed to escape from the water surface.

Read more about Evaporation and Molarity at; https://brainly.com/question/14718840

Answer:

A homogeneous mixture

Explanation:

A homogeneous mixture has the same composition throughout

The line starts at the bottom because it's the starting point. (You have to start somewhere, If that makes sense.)

I also noticed that the line is going up, which means she's going farther (in distance and time)

Answer:

10 must be added

Explanation:

Answer: B, E, and F

Explanation: It showed the correct answer after i got it incorrect. (E2021)

Answer:

A

B

D

E

Explanation:

GOT IT RIGHT ON MY ASSIGNMENT

Answer:

ore is naturally occuring solid material from which a metal or valuable mineral can be extracted

profitably.

the speed of arrow is 83m/per second

that means

83metres = 1 second

●The arrow would cover the distance of 83 metres in 1 second

may this helps you

bye

Answer:

56.94759 grams of NO2

Explanation:

Stoichiometric Equation:

1 S + 6 HNO3 → 1 H2SO4 + 6 NO2 + 2 H2O.

This is so you can create ratios between each compound in the reaction, and identify the limiting and excess reactants to determine exactly how much can be produced?

The coefficients or molecular quantity of each compound in the balanced equation represents the amount of moles.

To figure out how much can be produced, you have to convert 59.54 g of S into moles of S and 78 g of HNO3 into moles of HNO3.

A reference such as a periodic table can be very helpful as it has the atomic mass of each element which is the mass with respect to 1 mol of that element.

Answer:

cool

Explanation:

Answer:6.0g x 1 mol/18.02g x 40,65 kJ/mol

Explanation: just did the quiz

13.6 kilojoules (kJ) of energy is released when 6.0 g of water is condensed from water to vapor.

To calculate the energy released when 6.0 grams of water is condensed from water to vapor, we need to use the concept of heat of vaporization (also known as enthalpy of vaporization). The heat of vaporization is the amount of energy required to change one gram of a liquid into vapor at its boiling point, without any change in temperature.

The heat of vaporization of water is approximately 40.7 kJ/mol at its boiling point (100°C or 373.15 K). We can use this information to calculate the energy released when 6.0 grams of water is condensed.

Step 1: Calculate the number of moles of water (H₂O) in 6.0 grams.

Molar mass of water (H₂O) = 2 g/mol (for hydrogen) + 16 g/mol (for oxygen) = 18 g/mol

Number of moles of water = Mass of water / Molar mass of water

Number of moles of water = 6.0 g / 18 g/mol = 0.333 moles

Step 2: Calculate the energy released during condensation.

Energy released = Number of moles of water × Heat of vaporization

Energy released = 0.333 moles × 40.7 kJ/mol = 13.6 kJ

Therefore, approximately 13.6 kilojoules (kJ) of energy are released when 6.0 grams of water is condensed from water to vapor.

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Answer:

The first 50 elements along with their valences are given below :

1. Hydrogen = 1

2. Helium = 0

3. Lithium = 1

4. Beryllium = 2

5. Boron = 3

6. Carbon = 4

7. Nitrogen = 3

8. Oxygen = 2

9. Fluorine = 1

10. Neon = 0

11. Sodium = 1

12. Magnesium = 2

13. Aluminium = 3

14. Silicon = 4

15. Phosphorus = 3

16. Sulphur = 2

17. Chlorine = 1

18. Argon = 0

19. Potassium = 1

20. Calcium = 2

21. Scandiun = 3

22. Titanium = 3

23. Vanadium = 4

24. Chromium = 3

25. Manganese = 4

26. Iron = 2

27. Cobalt = 2

28. Nickel = 2

29. Copper = 2

30. Zinc = 2

31. Gallium = 3

32. Germanium = 4

33. Arsenic = 3

34. Selenium = 2

35. Bromine = 1

36. Krypton = 0

37. Rubidium = 1

38. Strontium = 2

39. Yttrium = 3

40. Zirconium = 4

41. Niobium = 3

42. Molybdenum = 3

43. Technetium = 7

44. Ruthenium = 4

45. Rhodium = 3

46. Palladium = 4

47. Sliver = 1

48. Cadmium = 2

49. Indium = 3

50. Tin = 4

Note :

An element like Iron, copper can have more than one valencies.

Answer:

50 elements chemical eq, atomic number, atomic mass, no.of electrons, no.of protons, no.of neutrons, electronic configuration and valancies are given in the above attachment

Explanation:

Hope it helps you

Answer:

Fe(s) + Cu2+(aq) ===> Fe2+(aq) + Cu(s)

Answer:

2CuFeS2+2SiO2+4O2→Cu2S+2FeSiO3+3SO2(1)

Explanation:

2CuFeS2+2SiO2+4O2→Cu2S+2FeSiO3+3SO2(1)

Answer: There are 0.000043 moles of melatonin.

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]

given mass = 10 mg = 0.01 g

molar mass of [tex]C_{13}H_{16}N_2O_2[/tex] = 232.28 g

[tex]{\text {moles of melatonin}}=\frac{0.01g}{232.28g/mol}=0.000043moles[/tex]

Thus there are 0.000043 moles of melatonin

Answer:

X represents London dispersion forces, and Y represents ion-dipole forces.

Explanation:

London forces occurs between molecules that are normally non-polar (electrically symmetric). It arises from instantaneous dipoles in molecules. It occurs in all substances.

Permanent dipoles are caused by non-symmetric electron distribution in molecules leading to a permanent dipole in the molecule such as in HCl. Interaction between the permanent dipole in these molecules and an ion is called ion-dipole interaction.

Hence; X represents London dispersion forces, and Y represents ion-dipole forces.

X represents London dispersion forces, and Y represents ion-dipole forces.

London forces:

Ion-dipole forces:

Hence; X represents London dispersion forces,

and Y represents ion-dipole forces.

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Answer:

solar energy drives the cycle by evaporating water from the oceans, lakes, rivers, and soil. As liquid water evaporates or transpires, it forms water vapor and clouds, where water droplets eventually gain enough mass to fall back to Earth as precipitation.

Answer:

Ethane & propane are members of same homologous series : alkane which is indicated with Cn H2n+2

Explanation:

Answer: snake grass hopper and monkey

Explanation: i took the test and this is what i got

Answer:

snake grasshopper and monkey

Explanation:

Answer:

Hey mate.....

Explanation:

This is ur answer.....

So,

If one mole has a mass of 18 grams, 25 grams would have a mass of 25 grams/ 18 grams per mole or 1.39 moles.

Hope it helps!

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Answer:

1.39 moles............

Answer:

the motion is different.

Explanation:

the the motion is different because the particle in a book is solid particles and solid are packed together so so they can't move freely but while the the particles in the air around it is gas particles and it are packed very loose and can move very easily anywhere like .Example - solid-book , eraser. gas-helium, oxygen.

Answer:

The law of conservation of mass States that matter can never be created or destroyed during c

Answer:

24.2 mL.

Explanation:

Assuming constant temperature, we can solve this problem using Boyle's law, which states:

Where:

We input the data:

And solve for V₂:

The closest option is the second one: 24.2 mL.

Answer:

the main use of coal in the United States is to generate electricity.

Coal is a combustible black or brownish-black sedimentary rock with a high amount of carbon and hydrocarbons

Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years.

Answer:True

Explanation:

Answer:

Five ( 5 ) is the correct answer

Answer:

Combustion as an Exothermic Reaction

Explanation:

When substances burn, they usually give off energy as heat and light. The combustion of wood is an exothermic reaction that releases a lot of energy as heat and light.

Answer:

Exothermic

Explanation:

because exothermic causes fires while endothermic doesn't