A 1.26 g sample of He gas has a pressure of 0.123 arm and a volume of 32.6 L, then the temperature of the gas is -117.7 degree C.
How do we calculate the temperature of gas?Temperature of any gas will be calculated by using the ideal gas equation as:
PV = nRT, where
P = pressure of gas = 0.123 atm
V = volume of gas = 32.6 L
R = universal gas constant = 0.082 L.atm / K.mol
T = temperature of gas = ?
n is moles of He gas and will be calculated as:
n = W/M, where
W = given mass = 1.26g
M = molar mass = 4 g/mol
n = 1.26 / 4 = 0.315 moles
On putting values we get,
T = (0.123)(32.6) / (0.315)(0.082)
T = 155.41 K = 155.41 - 273.15 = -117.7 degree C
Hence required temperature of the helium sample is -117.7 degree C.
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what is the formula for water
Answer:
H2O
Explanation:
EASIEST FORMULA ON EARTH
Which of the following best explain how Earth's rotation relates to living systems?
A. Earth’s rotation severely limits the amount of sunlight hitting a given region, which prevents living systems from surviving
B. By stabilizing temperatures for a given region, earth’s rotation helps sustain living systems in that region
C. Earth’s rotation forces many animals to migrate in order to continuously receive the Sun’s rays
D. Because Earth’s rotation brings darkness to a given region, plants are unable to survive in that region at night
Answer:
I think it's B
But A seems a good answer too
It might be D
But Imma go for C
Explanation:
PLEASE Answer asap! Compare two periodic families below. You must include at least two facts about each family. You may use any description of properties or periodic trends to help you.
Answer:
The alkali metals/group 1 are recognized as a group and family of elements. These elements are metals. Sodium and potassium are examples of elements in this family. Hydrogen is not considered an alkali metal because the gas does not exhibit the typical properties of the group. The largest family of elements consists of transition metals/group 3-12/group 3a. The center of the periodic table contains the transition metals, plus the two rows below the body of the table (lanthanides and actinides) are special transition metals. Even though both are metals, transition metals have higher melting points; they have higher density; they are less reactive with water; they react and form ions with different charges, but Group 1 metals only form 1+ ions. (Hope the is helpful! You can reword it if you want...)(same answer from the other same question you posted)
please help me with this question
Answer: I believe it would be B. Genus
Explanation:
I looked up the definitions for you and genus is defined as the group above species. Picture of definition attached.
A very small electronegativity difference leads to a:
a Polar covalent bond
b Non-polar covalent bond
c lonic bond
d None of the above
Magnetic poles are called domains.
True
False
Answer:
false
Explanation:
the magnetic domains in the area around a magnet where the force acts.
PLSSSS ANSWERRRRRR?????
What does the reaction rate measure?
O A. The collisions per second
O B. The speed of the reaction
C. The reaction activation energy
O D. The moles per liter of product
Answer:
The speed of the reaction
Explanation:
I just took the test and got it right... i hope this helps u :)
please help me with this question
Answer:
Magnesium Hydroxide or Milk of Magnesia
Explanation:
The chemical sign for Magnesium is Mg, and OH automatically means Hydroxide.
What is metallurgy?
A. Science of minerals.
B. Science of working with metals.
C. Science of breaking down rock.
D. Science of volcanoes.
Answer:
B science of working with metals
The attraction between water molecules and a Nation or a Clion occurs because water molecules are —
A.
nonpolar
B
symmetrical.
С
polar.
D
linear.
Answer:
answer is
c. Polar
hope this helps
Organisms change energy from the environment or from their food into other types of energy. This is called what?
Answer:
Metabolism
Explanation:
This is called Metabolism.
Metabolism is a combination of spontaneous chemical reactions which release non-spontaneous energy and chemical reactions requiring energy to proceed. In order to perform cellular processes, living organisms can take energy from food, nutrients or sunlight.
Why the colloid can't be filitred?Write it's 4 examples.
Answer:
Constituent substances of a colloid cannot be separated by ordinary filtration because the size of the particles in a colloid (or colloidal solution) is bigger than those in a true solution but smaller than those in suspension. It is between 1 nm to 100 nm in diameter.
ex- cheese, milk, aerosol spray, mayonnaise
Which of the following terms describes the area where the Himalaya Mountains formed?
A.)Convergent Boundary
B.)Transform Boundary
C.)Divergent Boundary
B.)Subduction Zone
Answer:
Convergent Boundary describes the area where himalayan mountains formed.
which pollutants come from air? How and why do these form?
Answer:
Air pollution is caused by solid and liquid particles and certain gases that are suspended in the air. These particles and gases can come from car and truck exhaust, factories, dust, pollen, mold spores, volcanoes and wildfires.
Explanation:
3) What is the mass of 1 mole of selenium (Se)?
Answer:
78.96 grams
Explanation:
I looked it up and that's what I found
hope it helps
Answer:
78.96 g mol
Explanation:
78.96 g mol
in the period table the mass of Se is 78.96 g mol
PLEASEEEEE ANSWERRR??
Which pieces of equipment are
needed to calculate the velocity of a
falling object?
A stopwatch and balance
B speedometer and magnet
C compass and tape measure
D tape measure and stopwatch
 why don't we ever see solid or liquid oxygen on earth?
Please help me on this
Answer:
the answer is 3(decay) and
the second isa 1(alfa particle) has a mass of equal to helium nucleus
3 of 12
Assessment: Force and Motion CBA
Four students recorded the time it took them to walk to school from their homes as shown in the table
below.
Student
1
2
3
Motion of Four Students
Distance (meters) Time (minutes)
1,100
20
1,026
19
848
16
795
15
4
Which student had the greatest average speed?
Student 1
Student 2
Student 3
Student 4
1
2
3
4
5
6
7
8
9
10
Next
what is 606 as a 2 sig fig answer?
6, 0
thats the answer, i hope it helps
Calculate the molarity of a solution prepared by dissolving 6.87 grams of AgNO3 in enough water to make 2.50 liters of solution.
Answer:
The molarity of the solution is 0.016 [tex]\frac{moles}{L}[/tex]
Explanation:
Molar concentration is a measure of the concentration of a solute in a solution.
Molarity (M) or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.
Molarity is determined by dividing the moles of the solute by the volume of the solution:
[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Being 169.87 g / mole the molar mass of AgNO₃, then you can apply the following rule of three: if 169.87 grams are contained in 1 mole, 6.87 grams are contained in how many moles?
[tex]amount of moles=\frac{6.87 grams*1 mole}{169.87 grams}[/tex]
amount of moles= 0.04 moles
Then:
number of moles of solute: 0.04 molesvolume: 2.50 LReplacing:
[tex]Molarity=\frac{0.04 moles}{2.50 L}[/tex]
Solving:
Molarity= 0.016 [tex]\frac{moles}{L}[/tex]
The molarity of the solution is 0.016 [tex]\frac{moles}{L}[/tex]
(No scammers) can someone help me pls
Answers is - 198 kilo joules
What is the Great Red Spot on Jupiter?
Answer:
The Great Red Spot is a storm in Jupiter's southern hemisphere with crimson-colored clouds that spin counterclockwise at wind speeds that exceed those in any storm on Earth. The Great Red Spot has slowly changed over the years, and is currently about 1.3 times as wide as our planet.
moreee help science plsssssssssssssssss helpp
The gas phase decomposition of phosphine at 120 °C
PH3(g)1/4 P4(g) + 3/2 H2(g)
is first order in PH3 with a rate constant of 1.80×10-2 s-1.
If the initial concentration of PH3 is 8.48×10-2 M, the concentration of PH3 will be 2.45×10-2 M after
s have passed.
Answer:
The decreasing in concentration occurs after 69.0s
Explanation:
A first order reaction follows the equation:
Ln [A] = -kt + ln[A]₀
Where [A] is the concentration of the reactant after time t
k is rate constant of the reaction
And [A]₀ is the initial concentration of the reactant
Replacing:
Ln 2.45x10⁻²M = -1.80x10⁻²s⁻¹*t + ln8.48x10⁻²
-3.709 = -1.80x10⁻²s⁻¹*t -2.467
-1.2416 = -1.80x10⁻²s⁻¹*t
69.0s = t
The decreasing in concentration occurs after 69.0s
what is rasching process only chemical reaction
Answer:
The Raschig process, the original commercial production process for hydrazine, involves oxidation of ammonia to chloramine with sodium hypochlorite, then further reaction of the chloramine with excess ammonia and sodium hydroxide to produce an aqueous solution of hydrazine with sodium chloride as a by-product.
Answer: The Rasching process is a chemical process for the producing phenol
Explanation:
True or False: Only animals can move pollen from plant to plant.
A. True
B. False
i think false because of the wind or insects
Part A
Campers want a travel cup that keeps the temperature of a beverage from changing for up to two hours.
They may want to keep a hot drink hot when they are in a cold place. Or they may want to keep a cold drink
from warming up in a hot environment,
Describe how you plan to design, build, and test a travel cup that uses thermal insulators?
The statement is "thermal insulators of a double-layered vacuum seal make a liquid heated when it's cold and keep it cool when it's hot."
What is thermal insulator?A thermal insulator is a material that inhibits heat from being conveyed from one location to another.
Campers seek a travel cup that cools liquids with a cold pack. Design the exterior portion of the cup to keep the drink cold after it has cooled down, as well as the interior compartment to contain the cold pack and channel heat from the liquid in the cup. One of the greatest ways to keep your coffee hot for a long time is to use vacuum insulation in a thermos. On the surface, the concept appears straightforward.
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