1. How many moles of water molecules are there in 39 grams of Chlorine?

2. How many molecules are there in 39 grams of Gold?​

Answer:

0.0956 M

Explanation:

Step 1: Calculate the moles corresponding to 6.25 g of barium nitrate (solute)

The molar mass of barium nitrate is 261.34 g/mol.

6.25 g × 1 mol/261.34 g = 0.0239 mol

Step 2: Convert the volume of solution to liters

We will use the conversion factor 1 L = 1000 mL.

250 mL × 1 L/1000 mL = 0.250 L

Step 3: Calculate the molarity of the solution

The molarity is equal to the moles of solute divided by the liters of solution.

M = 0.0239 mol / 0.250 L = 0.0956 M

Answer:

Boron is Nonmetal

Explanation:

hope it's helped

We are given:

Mass of the mixture = 1.5 grams

Number of Moles of NaHCO₃ = 0.01 mole

Mass of 0.01 moles of NaHCO₃:

Mass = number of moles * Molar mass

Mass = 0.01 * 84

Mass = 0.84 grams

Mass% of Na in NaHCO₃:

Molar mass of NaHCO₃ = 84 grams/mol

Molar mass of Na = 23 grams / mol

Mass% = (Molar mass of Na / Molar mass of NaHCO₃) * 100

Mass% = (23/84) * 100

Mass% = 27%

Mass of Na in 0.01 moles:

Since the Mass% of Na is 27% and the total mass is 0.84 grams

So, we can say that 27% of 0.84 is the mass of Na

Mass of Na = 0.84 * 0.27

Mass of Na = 0.23 grams

Mass% of Na in the mixture:

Total mass of the mixture = 1.5 grams

Mass of Na in the mixture = 0.23 grams

Mass% of of Na in the Mixture = (Mass of Na / Mass of Mixture) * 100

Mass% of Na = (0.23 / 1.5) * 100

Mass% of Na = 15.3%

Therefore, we have 15.3% Na in the given mixture by mass

KE at 30°F=0.942 KE at 60°F

The average kinetic energy value is only affected by temperature changes. The higher the temperature, the average kinetic energy of the molecule increases  

This molecule is very small when compared to the distance between molecules, so the volume of gas contains mostly empty space  

Gas particles move randomly (both speed and direction , as vector)  

Average velocities of gases can be expressed as root-mean-square averages. (V rms)  

[tex]\large{\boxed{\bold{v_{rms}=\sqrt{\frac{3RT}{Mm} } }}[/tex]

R = gas constant, T = temperature, Mm = molar mass of the gas particles

Kinetic energy :

[tex]\tt KE=\dfrac{1}{2}mv^2[/tex]

The temperature outside is 60°F

Convert to Celcius and Kelvin

°C = 5/9 (°F-32)

[tex]\tt ^OC=\dfrac{5}{9}(60-32)=15.56[/tex]

°K = °C + 273

[tex]\tt ^oK=15.56+273=288.56[/tex]

For 30°F :

[tex]\tt ^oC=\dfrac{5}{9}(30-32)=-1.1\\\\^oK=-1.1+273=271.9[/tex]

[tex]\tt KE_1=\dfrac{1}{2}m.\dfrac{3R.288.56}{Mm}[/tex]

[tex]\tt KE_2=\dfrac{1}{2}m.\dfrac{3R.271.9}{Mm}[/tex]

[tex]\tt \dfrac{KE_2}{KE_1}=\dfrac{271.9}{288.56}=0.942\\\\KE_2=0.942KE_1[/tex]

Answer:

1.0979g of Na2CO3

0.8471g of NaHCO3

Explanation:

NaHCO3 and Na2CO3 reacts with HCl as follows:

NaHCO3 + HCl → NaCl + H2O + CO2

Na2CO3 + 2HCl → 2NaCl + H2O + CO2

Moles of HCl required were:

0.03531L * (0.8724mol / L) = 0.03080 moles of HCl

With this information we can write 2 equations:

1.9450g = X + Y (1)

X is the mass of NaHCO3 and Y is mass of Na2CO3

Also we can write:

0.03080 moles = X/84 + 2Y/106 (2)

Where 84 is molar mass of NaHCO3 and 106 is molar mass of Na2CO3, 2 is due the reaction (2 moles of HCl react per mole of Na2CO3)

Replacing (1) in (2):

0.03080 moles = (1.9450-Y)/84 + 2Y/106

0.03080 = 0.023155 - Y/84 + Y/53

0.007645 = 0.00696316Y

Y = 1.0979g of Na2CO3

And mass of NaHCO3 =

1.9450g - 1.0979g =

0.8471g of NaHCO3

Answer:

B. 178.3

178,300 divided by 1,000 is 178.3

Answer:

178.3L

Explanation:

1mL=0.001L

178300mL=?

we just criss-cross it

178300×0.001=178.3L

Answer:

The objects must be different temperatures and they must be in contact.

Explanation:

For conduction to take place between two objects, they must be in contact with one another and at different temperatures.

Answer:

The objects must be different temperatures and they must be in contact.

Explanation:

Got a 100% on edge 2020

HOPE THIS HELPS!!!

Answer:

12-6=6

the answer is A)6

Answer:

it is the letter D

Explanation:

Considering the definition of wavelength, the correct answer is option D. You can see that "d" represents the distance between two consecutive highs, and then the wave repeats. In this way the definition of wavelength is fulfilled.

In a periodic wave, that is, for the type of wave that repeats with exactly the same shape every given time interval, the wavelength is the physical distance between two points from which the wave repeats.

That is, the wavelength is its spatial period, that is, the distance at which the waveform repeats itself. Normally, two consecutive points that have the same phase are considered: two maximums, two minimums, two zero crossings (in the same direction).

In summary, the wavelength is the actual distance that a disturbance can travel in a given time interval, the quas between two consecutive maxima with respect to the physical property of the wave.

Considering the definition of wavelength, the correct answer is option D. You can see that "d" represents the distance between two consecutive highs, and then the wave repeats. In this way the definition of wavelength is fulfilled.

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Answer:

2.14 moles of H₂O₂ are required

Explanation:

Given data:

Number of moles of H₂O₂ required = ?

Number of moles of N₂H₄ available = 1.07 mol

Solution:

Chemical equation:

N₂H₄  +   2H₂O₂       →   N₂ +  4H₂O

now we will compare the moles of H₂O₂ and N₂H₄

                          N₂H₄     :      H₂O₂  

                            1           :        2

                            1.07      :         2×1.07 = 2.14 mol

Yes because it can produce unlike nonliving organism

Answer:

Heat energy is transferred to cooler objects to reduce the temperature of those objects.

Explanation:

The fourth option is not correct.

A correct way of writing it would be : " Heat energy is transferred from cooler objects to reduce the temperature of those objects.". When an object loses heat energy, its temperature reduces. Conversely, when an object receives heat energy, its temperature increases.

Answer:

No. All four hybrids are equivalent and the angles between them are all the same, so we can use any of the two to hold the nonbonding pairs.

Explanation:

Orbital hybridization has been the combination of the atomic orbitals for the formation of a new hybrid. No, it does not matter which orbitals are used to hold the nonbonding electron pairs.

Hybrid orbitals are said to be formed by the mixing of the atomic orbitals with different energy and geometrical shape that allows the understanding of the atomic bonding and molecular geometry of the compounds.

It includes sp, sp², sp³, sp³d, and sp³d² which have various arrangements, including linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral. The hybrid orbitals are formed by the combination and overlapping of the s and p orbital.

It does not matter which sp³ orbital holds the two non-bonding electron pairs as all four hybrids have been known to have equivalent angles between them so it will not matter which hybrid has the non-bonded electrons in them.

Therefore, it will not matter which two sp³ hybrid holds the electron pairs that are not involved in bonding.

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Answer:

[tex]P=273.1atm[/tex]

Explanation:

Hello!

In this case, since the Van der Waals' equation is used in order to analyze a gas slightly deviated from the ideal condition and is defined as:

[tex]P=\frac{RT}{v_m-b}-\frac{a}{v_m^2}[/tex]

Whereas a and b for oxygen are 0.0318 L/mol and 1.36 atm*L²/mol² respectively and represent the effective volume and the eventual interactions among the gas molecules. Moreover, the molar volume, vm, is:

[tex]v_m=\frac{0.8200L}{9.439mol}=0.08687L/mol[/tex]

Thus, the required pressure turns out:

[tex]P=\frac{0.082\frac{atm*L}{mol*K}*304.4K}{0.08687L/mol-0.0318L/mol}-\frac{1.36\frac{atm*L^2}{mol^2} }{(0.08687L/mol)^2}\\\\P=453.3atm-180.2atm\\\\P=273.1atm[/tex]

Best regards!

Answer:

Boiling point.

Heat is required to break the intermolecular forces of attraction between the particles. The role of coolant is to lowers the freezing point of water, and to increase the boiling point of water.

Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.

Coolant is added to car radiators to keep the water from becoming a gas and evaporating when the car gets hot. The role of coolant is to lowers the freezing point of water, and to increase the boiling point of water.

Therefore, the role of coolant is to lowers the freezing point of water, and to increase the boiling point of water.

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Answer:

[tex]T_{eq}=27.97\°C[/tex]

Explanation:

Hello.

In this case, for equilibrium temperature problems, it is said that the heat balance allows us to notice how the hot substance heats up the cold substance until they reach the equilibrium temperature which is a temperature that remains constant upon time. Thus, since here the hot substance is the nickel and water gains that released heat by the nickel we can write:

[tex]Q_{Zn}=-Q_{water}[/tex]

Which can be written in terms of temperatures, masses and specific heats:

[tex]m_{Zn}C_{Zn}(T_{eq}-T_{Zn})=-m_{water}C_{water}(T_{eq}-T_{water})[/tex]

Thus, solving for the equilibrium temperature we write:

[tex]T_{eq}=\frac{m_{Zn}C_{Zn}T_{Zn}+m_{water}C_{water}T_{water}}{m_{Zn}C_{Zn}+m_{water}C_{water}}[/tex]

Now, plugging in the known data, considering the mass of water 64.00-4.00=60.00 g and its initial temperature, 25.00°C, we obtain:

[tex]T_{eq}=\frac{34.10g*0.444\frac{J}{g\°C}* 77.17\°C+60.0g*4.184\frac{J}{g\°C}*25.00\°C}{34.10g*0.444\frac{J}{g\°C}+60.0g*4.184\frac{J}{g\°C}}\\\\T_{eq}=27.97\°C[/tex]

Best regards!

The final temperature of water is required.

The final temperature of water is [tex]27.97^{\circ}\text{C}[/tex].

T = Equilibrium temperature

[tex]T_n[/tex] = Temperature of nickel = [tex](77.17^{\circ}\text{C}+273.15)\ \text{K}[/tex]

[tex]T_w[/tex] = Temperature of water = [tex](25^{\circ}\text{C}+273.15)\ \text{K}[/tex]

[tex]c_n[/tex] = Specific heat of nickel = [tex]0.444\ \text{J/g}^{\circ}\text{C}[/tex]

[tex]c_w[/tex] = Specific heat of water = [tex]4.184\ \text{J/g}^{\circ}\text{C}[/tex]

[tex]m_n[/tex] = Mass of nickel = 34.1 g

[tex]m_w[/tex] = Mass of water = 60 g

The heat balance of the system is given by

[tex]m_wc_w(T-T_w)=m_nc_n(T_n-T)\\\Rightarrow m_wc_wT-m_wc_wT_w=m_nc_nT_n-m_nc_nT\\\Rightarrow T=\dfrac{m_nc_nT_n+m_wc_wT_w}{m_wc_w+m_nc_n}\\\Rightarrow  T=\dfrac{34.1\times 0.444\times 350.32+60\times 4.184\times 298.15}{60\times 4.184+34.1\times 0.444}\\\Rightarrow T=301.12\ \text{K}=301.12-273.15\\\Rightarrow T=27.97^{\circ}\text{C}[/tex]

The final temperature of water is [tex]27.97^{\circ}\text{C}[/tex].

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Answer:

A. It occurs when a gas passes through a tiny hole.

Explanation:

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Answer:

Mass = 1.85 g

Explanation:

Given data:

Number of formula units = 2.8×10²²

Mass of NaOH = ?

Solution:

1 mole contain 6.022×10²³ formula units

2.8×10²² formula units × 1 mol  /6.022×10²³ formula units

0.46×10⁻¹ mol

0.046 mol

Mass of NaOH:

Mass = number of moles × molar mass

Mass = 0.046 mol × 40 g/mol

Mass = 1.85 g

Answer:

d. reducing agent

Explanation:

Na acts as a  reducing agent. A reducing agent is a substance whose function is to reduce or donate electrons to another, and by doing so it becomes oxidized.  We can see the mechanism of the reaction in the image attached below.

Answer:

c. closer together and lower in energy than those in a gas.

Explanation:

In the different states of matter, the arrangement of particles and the kinectic energy that exists in the state of matter varies depending on which state the matter is in.

The particles of Solid are denser and closer than that of liquid. In solid state, the force of attraction between the particles are greater than the kinectic energy of the particles in a solid matter. Therefore, the particles in solid matter are closer together than those in liquid and gas. And also, the energy is lower in Solid matter than those in liquid and gas.

Liquid on the other hand, has denser particles that are closer together than those in gas. Also, liquid particles has lower energy than those in gas.

Particles in gas are more freer and farther apart from each other than the particle sin solid and gas. Also, particles in gas is greater than those in liquid and solid.

Therefore, the likely arrangement of particles in a liquid is that they are:

c. closer together and lower in energy than those in a gas.

Answer:

When air in contact with the ocean is at a different temperature than the sea surface, heat transfer by conduction takes place. The ocean also absorbs and stores energy from the sun, and when precipitation falls, it releases heat energy into the atmosphere.

Hope it helps:)

Answer:

A and D

Explanation:

Answer:

Although Thomas Jefferson came to power determined to limit the reach of the federal government, foreign affairs dominated his presidency and pushed him toward Federalist policies that greatly contrasted with his political philosophy. The first foreign episode involved Jefferson's war with the Barbary pirates. For the previous century or so, Western nations had paid bribes to the Barbary states, which would later become Morocco, Algeria, Tunis, and Tripolitania, to keep them from harassing American and merchant ships

Explanation:

Answer:

0.08kg

Explanation:

Given parameters:

Temperature of water  = 100°C

Quantity of heat released = 180414.08J

Unknown:

Quantity of water condensed  = ?

Solution:

This is simple phase change process without any attendant change in temperature.

To solve this problem, use the formula below;

             H  = mL

H is the heat released

m is mass

L is the latent heat of condensation of water  = 2260 kJ/kg

 Insert the parameters and solve;

       180,414.08 = m x  22.6 x 10⁵ J/kg

         m  = [tex]\frac{180414.08}{2260000}[/tex]   = 0.08kg

Answer:

See explanation for details

Explanation:

a) Now from the data given, recall that;

N/No = (1/2)t/t1/2

Where,

N= amount of radioactive material remaining at time t

No= Amount of radioactive material originally present

t= time taken for N amount of radioactive material to remain

t1/2= half life of radioactive material

So,

N/No = (1/2)^20,000/5730

N/No = (1/2)^3.49

N/No = 0.089

Since the fraction N/No is the fraction remaining after t years, then;

Percentage of Carbon-14 left after 20,000 years = 0.089 * 100 = 8.9%

b) From;

0.693/t1/2 = 2.303/t log No/N

Given that N = 0.42 No

Hence;

0.693/5730 = 2.303/t log (No/0.42No)

1.21 * 10^-4 = 0.87/t

t= 0.87/1.21 * 10^-4

t = 7190 years

c) Radiocarbon dating is a method of obtaining the age of an object derived from plants or animals by comparing the Carbon-14 activity of living things with that of the sample under study. Due to contamination, the age of artifacts obtained by Carbon-14 dating may yield outlying figures.

Answer:

The answer is

C. Graph A

Answer:

Graph A

Explanation:

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Answer:

Isotopes are atoms of an element with the normal number of protons and electrons, but different numbers of neutrons. Isotopes have the same atomic number, but different mass numbers. GOOD LESSONS♡

Answer:

random internal motion of atoms and molecule

Explanation:

The primary cause of diffusion is the random internal motion of atoms and molecules.

Randomness of atoms and molecules results in diffusion.

Answer:

random internal of motion of atoms and molecules

Explanation:

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