Answers
Chemical formula for nitrogen gas is N₂.
To find the number of molecules in the given sample, we have to convert the mass of the sample to moles by using the molecular mass of elemental nitrogen (N₂).
Now, we have to use Avogadro's number (6.022x10^23) that indicates the number of molecules in one mole of substance:
It means that there are 2.79x10^24 molecules of elemental nitrogen.
To find the number of atoms we just have to multiply the number of molecules by 2, which is the number of atoms of nitrogen per molecule of elemental nitrogen:
There are 5.59x10^24 atoms of nitrogen in the sample.
Related Questions
The specific heat capacity of liquid water is 4.18 J/g-K. How many joules of heat are needed to raise the temperature of 5.00 g of water from 25.1°C to 65.3°C?
When an ion‑selective electrode for X+ was immersed in 0.0482 M XCl, the measured potential was 0.0460 V . What is the concentration of X+ when the potential is 0.0610 V ? Assume that the electrode follows the Nernst equation, the temperature is at 25 °C, and that the activity coefficient of X+ is 1.
Saved Propane burns in air according to the equation C3Ha(g 502lg)3CO2) + 4H20(g) What volume of O2 in liters would be required if 15.0 L of propane burns, assuming that all of the gases are under the same conditions? Short Answer Toolbar navigation E I E B IUS EA This question will be sent to your Instructor for grading. 20 of 25 l Next > Prev nere to search
If 73.5 mL of 0.200 M KI(aq) was required to precipitate all of the lead(II) ion from an aqueous solution of lead(II) nitrate, how many moles of Pb2+ were originally in the solution?
Answers
Answer:
-270.76°C
Explanation:
Given that metal Thallium becomes superconducting below the temperature of 2.39 kelvin i.e. this temperature is critical temperature for Thallium and below critical temperature a metal offers no resistance to the flow of electric current. Also the metal below its critical temperature expels the magnetic field in such a way that they do not penetrate the metal and pass through its surface only.
We have the relation between kelvin scale and degree Celsius scale of temperature measurement as:
b. all the chloro groups in equatorial positions.
Answers
Answer:
This is required answer.
Explanation:
Given that,
1,2,3,4,5,6-hexachlorocyclohexane
(a). We need to draw 1,2,3,4,5,6-hexachlorocyclohexane with all the chloro groups in axial positions
Using given data
We draw 1,2,3,4,5,6-hexachlorocyclohexane with all the chloro groups in axial positions.
When we say that all the chloro groups in axial position that means axial bonds are vertical.
(b). We need to draw 1,2,3,4,5,6-hexachlorocyclohexane with all the chloro groups in equatorial positions
Using given data
We draw 1,2,3,4,5,6-hexachlorocyclohexane with all the chloro groups in equatorial positions.
When we say that all the chloro groups in equatorial position that means axial bonds are horizontal.
Hence, This is required answer.
True
False
Answers
Answer: False
Explanation: Alloys are harder and stronger because the different-sized atoms of the mixed metals make the atomic layers less regular, so they cannot slide as easily.
Answers
We have that from the Question, it can be said that The partial pressure of He would give a solubility of 0.730 M is
P_2=4.7atm
From the Question we are told
At a particular temperature, the solubility of He in water is 0.080 M when the partial pressure is 1.7 atm. What partial pressure of He would give a solubility of 0.730 M
Generally the equation for constant temperature is mathematically given as
Therefore
The partial pressure of He would give a solubility of 0.730 M is
P_2=4.7atm
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Answer: Partial pressure of He that would give a solubility of 0.730 M is 15.5 atm
Explanation:
Henry's law states that the amount of gas dissolved or molar solubility of gas is directly proportional to the partial pressure of the liquid.
To calculate the molar solubility, we use the equation given by Henry's law, which is:
where,
= Henry's constant =?
= partial pressure = 1.7 atm
Putting values in above equation, we get:
To find partial pressure of He would give a solubility of 0.730 M
Thus partial pressure of He that would give a solubility of 0.730 M is 15.5 atm
B. x=10
C. x=12
D. x=14
Answers
If there is direct variation and y=75 when x=25,when y=48 X = 16. Therefore, option A is correct.
What is direct variation ?
link between two variables that can be described mathematically by an equation where one variable equals a constant multiplied by the other. For instance, the constant of variation is k = = 3 if y varies straight as x and y = 6 when x = 2. Consequently, y = 3x is the equation that describes this directvariation.
When x is not equal to zero, an equation of the form y = kx describes the linear function known as direct variation. When x is not equal to zero and k is a nonzero real number constant, the equation of the form xy = k describes the nonlinear function known as inverse variation.
x = ky
where k is constant
25 = k × 75
25 / 75 = k
k = 1 / 3
now when y = 48 then substitute the values
x = ky
x = 1 ÷ 3 × 48
x = 16
Thus, option A is correct.
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first u find k so :
25 = k * 75
25/75 = k
k = 1/3
now when y = 48 just substitute the values
x = ky
x = 1/3 * 48
x = 16
the answer is A) x=16
Energy that is stored or released during a chemical reaction
b
Energy that is destroyed during a physical change
c
Energy that is released during a phase change
d
Energy that is created when a substance is being burned
Answers
Final answer:
Chemical energy is the energy that is stored or released during a chemical reaction. It exists within the chemical bonds of molecules and can be converted into other forms of energy.
Explanation:
Chemical energy refers to the energy that is stored or released during a chemical reaction. It is a form of potential energy that exists within the chemical bonds of molecules. When a chemical reaction takes place, these bonds are broken or formed, resulting in the release or absorption of energy.
For example, when a fuel such as gasoline is burned, the chemical energy stored in the hydrocarbon molecules is converted into heat and light energy. Similarly, during photosynthesis, plants convert sunlight into chemical energy in the form of glucose.
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Explanation:
Chemical energy
Chemical energy is energy stored in the bonds of chemical compounds, like atoms and molecules. This energy is released when a chemical reaction takes place.
Usually, once chemical energy has been released from a substance, that substance is transformed into a completely new substance.